It is interesting to see this thread is longer than its opposite thread, which is also in the Off-topic/PC gaming section.

I guess its interesting to see that alot of games people like are also disliked by others. I do have a contender for biggest disappointment, E.T. for the Atari 2600. Download a 2600 emulator and the ROM image for this game and prepare to go INSANE as you get old E.T. out of those pits, again, again and again. And again. But I think its a true contender for top disappointment because of the expectations of not the players but the designers and publishers. There was a rumor they printed more copies than how many 2600's existed and alot of cartridges were just dumped in landfill. A case for not letting marketing place deadlines on the designers.

To you, Sins is awsome to me it sucks. That's why I unistalled it from my system and left my copy to collect dust.

I'm sure it's been mentioned in this thread somewhere by now, but I'll throw in my vote for Oblivion. After playing hundreds of hours of Morrowind, Oblivion felt like a step backward in so many ways.

Age of Conan - terrible all around

Command & Conquer 3 - C&C Generals was a much better game, all around.

Hellgate London - if it played more like Diablo, while trying to be less of an MMO, it would have been great (minus the bugs too, of course...)

And that is why I should not post when I am tired. I can never fully express myself correctly.

No, the game is not crap. If it was I would not have enjoyed it so much.

The state they released the game in was crappy however. Rushed through production to get it on the shelves before Christmas.

I am just getting exhausted when a mediocre that has great potential is instantly thrown on a pedistal and worshiped. 

Yes, I played it a ton as well. I was "uber cool" and got every achivement (minus one). I still get the urge to run around and kill zombies. This doesn't make it an awesome game.

The bugs it was released with were rediculous. Did you not own the game early on? If you did than you know how it was......but if you didn't let us have a look.

-Infected being able to switch sides and kill themselves and switch back

-Infected hunter infinite spawn trick

-Ability to skip any cresendo

-Machine gun uber jump trick

-Ability to walk through the whole game using just about nothing but melee

-Finals that required nothing more than 4 shotguns and a corner

-Infected completely blocking off survivors paths with  enviorment objects

-Throw a molotov in an elevator? Thats a 50 foot fall

Need I go on?

Yes I know some games are released buggy, but this was a bit rediculous. It breaks Stardocks Gamer Bill of Rights.

+Gamers shall have the right to demand that games be released in a finished state.

+Gamers shall have the right to demand that download managers and updaters not force themselves to run or be forced to load in order to play a game.

I threw the second one on there because I hate Steam.  

I just wish would hold out for better. L4D could be so great. I mean so really great. It could be the best there ever was. But some people will defend it to the death about how it is already there. At the best....and I mean the very best, L4D is no better than the average FPS. Mindless killing for the purpose of user relaxation.

No. I do not believe that. That is why I am ending this here. Everyone has opinions. There is no right, there is no wrong; only hate.

By the by, I still do fire up the game now and then for some killing....If you want I can add you to my friend's list and we can get a game or two in together.

Going back on topic, Someone mentioned Oblivion as well as I. 

Oblivion had such potential. A sequel to Morrowing, which was pretty darned good. Morrowind was a sequel to Daggerfall which was pretty darned good as well (for its time). But what ruined it for me was two things. In Morrowind they had the silt striders for "fast travel". You basically had to be at one and could only travel to certain other silt striders. This made it faster than running somewhere, but would sometimes still take multiple trips. Sometimes you had to take a boat. It made the world nice and large. In Oblivion you could instantly fast travel from anywhere to any town. In the middle of the wilderness, meh....just fast travel home. That really saddened me. 

The ultimate kill for the game was the "basing creature levels on your own level" system. I will always hate this system. I had the expansions for Oblvion and accidently started the "Knights of the Nine", or whatever it was called, quest line. I completed it and had a rediculous set of armor that leveled with me and could be freely recharged. I had a free house. I was a level 5 when this happened. Needless to say everything was a cakewalk since then. I cakewalked through the arena and become the champion. I was cakewalking through the shrine quests (getting the ulimited lockpick sealed me as unstoppable). I never even finished the main story. I really wanted to for the story's sake.....but well...I was just getting bored. It was like having an infinite star on in Super Mario Brothers 3. Then getting the flutes. Then warping to the last stage. After a week with Oblivion I went back to Morrowind.  

Dark Brotherhood and their light armor! 

It was Morrowind. That started the quest line that required the second expansion...where you got to meet the two other Demigods (not Vivic). I cannot remember their names but it was Sotha Sil? (Crazy clockwork guy) and that mean....well...to put it bluntly...bitch.

And yes, that armor was nice, but I eventually found better. I was always more into medium armor over heavy and light. That was one thing I loved about the game, you could have the best light armor in the game but if you were not trained in light armor, it was trash.

Oblivion starts with Capt. Picard of the Enterprise getting an unglorified death scene.

I do live in the United States.

Another vote for MOO3.

My last big disappointment (and second-biggest overall) was Rome Total War.  With the exception of the soundtrack and improved battle interface, it was a letdown in every way, especially after my superlative experiences with its predecessors Shogun and Medieval.  AI and faction/unit balance was nonexistent, and the game was so unhistorical that even I couldn't suspend my sense of disbelief (and I'm generally not overly picky about such things). 

It was -- to put it simply -- a steaming pile of horse dung.  I didn't even bother getting Medieval 2, since I knew it would suffer many of the same problems (being based on the same engine)....and I was right. 

If you're asking what my biggest disappointment of all time is, however, then chalk up another vote for Master of Orion III.  I still want to weep when I think about what might have been....   

1. Black and White: This was the beginning of the long, slow, and tragic putrification of Peter Molyneux. A man once responsible for such classic landmarks of gameplay as Populous, Syndicate and Dungeon keeper degenerates into a soulless, eye-candy pushing hack. If anyone out there harbours a desire to spend countless hours slapping a giant ape in a fruitless attempt to teach it not to eat its own excrement than this is the game for you.
 
2. Deus Ex 2: Infamy, infamy, the consoles all have it in for me. This abomination alone is reason enough for a fascist anti-console movement to suspend the democratic process, seize the apparatus of state, and burn all games consoles at mass rallies. Surrendering to totalitarianism is a small sacrifice to ensure something like this never happens again.
 
3. Oblivion: The anti-RPG. Loved by mentally disturbed LARPers who enjoy interior decoration, playing dress up, and sitting in darkened rooms pretending to be elves; loathed with an almost incandescent passion by the hardcore RPG community. For my part, I found the bland world design hugely disappointing after Morrowind. Sure Morrowind has it flaws, but it's one of most richly designed and cohesive worlds I've ever encountered in a computer game. Oblivion, in contrast, is the RPG equivalent of beige.
 
4. Rome Total War: Rome Total Siege - nothing else matters. There is no strategy, the 3D campaign map is an exercise in pointless micromanagement, both the tactical and strategic AI are worse than Medieval, and the 'tactical' battles are speeded up to the point of almost eliminating tactics. Thankfully there's always Europa Barbarorum.
 
5. Gothic 3: Broken combat, broken performance, broken save system, broken quest scripts, broken skills, broken NPCs, broken world mesh. The only thing that wasn't bugged on release was the into movie. Americans can count themselves lucky that they got the patched version. The European retail release contained a bug which accidently broke down the very fabric of reality, opening a rift into hell and unleashing eons old spirits of darkness to slake their unspeakable bloodlust on hapless gamers. I had to have my PC exorcised.

Guess I'm not the only one.

Master of Orion 3 - the most awaited game, dissapointed me so much, I almost gave up gaming. Bought it, tried to give it a chance for several days, never played it again.

Heroes 4 -  such a dissapointment. Uglier, slower and so lacking in ballance compared to its prequel.

Hellgate - boring.