It was made by Stardock, the guys with all the fancy little Windows visual stuff. Supposed to the new wave of games: DRM-free. You literally pop in the disc to install, no CD key, never need the CD again. Love it.
I'm not a big fan either, especially because they can take super-long to play and take a while to master. In Sins, there are actually saves for multiplayer games because they can literally last days (24 hour times x days). It depends on how many stars/planet systems you want, really, because it scales pretty nicely. However, it is one of the largest scale RTS games I've ever seen. It can get ridiculous at times.
Wow! I know exactly how you feel. Like, I loved it for the times that I played it, but now I can't even touch it. I'm not sure why, either. A friend of mine who has been keeping with it tells me that I just need to know more people to play with as L4D can turn into a crapfest with an AFK guy and useless teammates. Replay value is fun, but at the same time, it is literally the same map, same route nearly every time...
I'm feeling it, too. We went to one of those LAN cafes for an overnight and they had Flatout there so after many hours of fragging, we spent the last 2 hours playing Flatout and it was a blast. I mean, it is just fun to play. I was pleasantly surprised by the graphics, too. I think it is definitely next on our list.