I took a test to find games I would like, and the game "Chromehounds" won by a landslide. I had never heard of it before, but it's a mech-building multiplayer game on the Xbox 360. Unfortunately, the servers were taken down at some point, but Bomb Dog Studios (
http://bombdogstudios.com/) is working on a sequel called Modular Assault Vehicle for PC. It's in beta, and is available for $20. I haven't played it yet so I can't comment on how good it is. I haven't even played Chromehounds. But it looks pretty cool, so I'm going to check it out.