For those who need a SP campgain this game sort of has one... you.

Let me first say, In regards to Sins, yes, they should've had a SP campaign.  I was disappointed when they didn't.  However, the extremely flexible custom map editor saved them from my negative opinions of doom.  I spent an hour playing around with the editor, see what functions did what.  And then I decided that I could create my own storyline. 

For example- 3 races: TEC, Advent, Vasari, on a single star map of 100 planets- I called it the Helios Sector.  I set the AI on Hard Random,  and wow, was it a huge fight.  f'ing epic. I expanded and took half the sector by the time I encountered the Advent.  I moved my capital to my frontline base, Hyperia, and fortified the terran planet to the max. 3 repair bays, 3 frig yards, a cap shipyard, and as much gauss and hangar bases as I could stuff into it.  It was my citadel- my fortress- my bastion of light shining against the alien horde.  The planet itself was a strategic hub- and I knew it would be my objective to take as soon as my scouts discovered it.  From there I could launch my assault against the enemy and mantain territorial control.

But the enemy had their own plans.  The Advent struck first.  I have this feeling the AI knew it's strategic importance-it wasn't a choke point in the map as there was another that they could've used to get around- they could've avoided if they wanted to.  No, I think they knew if they could crack that planet my empire would fall.  And sure enough, they came.

It was massive. With PSIDAR researched I watched a seamingly endless trail of ships pour through the phase line toward Hyperia.  At the moment of attack, my forces were divided into 3 fleets as 1 was ready for the assault, fleet 2 was station 2 jumps away guarding another lane, and fleet 3 was expanding and weeding out rebels, militia, and other scum.  When the Battle of Hyperia commenced i was outnumbered 3-1 in the grav well.

The start of the attack I was holding them off as my 2nd fleet was on it's on it's way. The 3rd was a long ways away but I felt I wouldn't need to bring em in.  Things looked promising, until the Vasari struck.  A wormhole. I foolishly forgot about it and they hit me in my undefended back planets.  I desperately redirected my 3rd fleet to stop the vasari but they were outnumbered. The Vasari broke through.  Apparently, the Vasari and Advent AI knew I was the biggest threat and they allied because I observed their ships moving through grav wells and not attacking each other.  I guess for them, the enemy of my enemy is my friend.  not good for me.

The Battle of Hyperia was continuous for over 2 hours and although I was successful at driving them off I paid a heavy cost.  I lost 80% of my fleets and so many capships that I lost count.  Hyperia was bombed to bits, and I had to re-colonize the planet just to build up the logistical and tactical infastrucure.  But nonetheless, my capital was still mine- it had become a personal matter to not let the capital fall.

But even the victory at Hyperia had a bitter taste.  The Vasari had taken 3 planets outside of the wormhole and established a foothold. And the victory was shortlived.  The Advent re-built up, then returned to Hyperia.  But because I had been weakened by the two front war (and the crippled economy due to lost planets) I lost my ground.  From there it was a slow battle of retreats as both races continued to take one planet at a time.  Near the end, the Vasari offered me a mission- kill 10 Advent ships. I mustered every ship I could to achieve the mission- and I succeeded.  The result increased my favorability with the Vasari enough so could offer a cease fire and they accepted!  and they were just one jump from my starting planet.  Unfortunately, by then the damage was done- my empire was reduced to 10% of what it originally was... and with the Advent pressing for my extermination, I knew it was over-  I surrendered.

Total game length: 8 hours.

Now, how's that for a single player experience!?  Like I said, the SP experience is only as good as you make it to be.