Sometimes, you'll end up buying the game and playing through it and go back to the review and then truely wonder how much time that reviewer spend on the game. I've seen instances, where if the review played a bit longer, things that he griped about were resolved or changed to make things easier.
I still remember Suikoden IV getting docked for how slow it takes for the boat to move between islands. What the reviewer didn't know was that you could actually press a button and speed up the travel. Or, you get a reviewer that hates a specific genre, reviewing that genre, and not giving it a chance.