I loked at borderlands and I have to say I really like the looks of it.
I sold my PS3 gathering dust before M.A.G. could come out, but that game will have huge amounts of lag anyways. 256 people, are you fucking kidding?
so for a list:
-Borderlands
-Modern Warfare 2 (Mainstream, if you don't like it then fuck off)
-Brutal Legend, It looks like something different therefore fun, right?
-Halo ODST
-Need For Speed Shift (hoping it won't suck like most racing games out right now)
-Battlefeild Bad Company 2
-Assasins Creed 2
-Army of 2: The 40th Day
-Left For Dead 2
-Zombie Apocalypse
I am also looking at a game called
2025: Battle For Fatherland sounds like it has a very immersible story, but the developers are so poor it might not even be released.
Edit: sorry about the ones with numbers on the end, I just copied and pasted from my wishlist

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