Reposting for a new page in case someone missed it and in hopes it helps someone decide:
Games that you should buy if you don't already have:
New Vegas (it's what fallout 3 should have been)
Doom 3 (it's a classic!)
ALPHA PROTOCOL (some of you will hate it because it's rather janky, and the combat is a little clunky, but beneath all that you have a great RPG where your choices actually change the "conversation battles" as you could call it.)
Serious Sam Gold (it's pretty much the newest version of the "let 'er rip" version of FPS games that used to be standard fare on the PC, it's gorgeous too)
Trine (Frozenbyte hit it out of the park with this one. You control three different characters that do three different things, and you use them in a side scrolling adventure puzzle game that's as pretty as it is fun and cute)
Bionic Commando Rearmed (a classic game redone in 3D, very amusing with neat retro gameplay)
Games that are alright, it's hit or miss:
Bully (you get to be a bully. While unique, it just feels like a kids version of GTA without all the GTA parts)
Singularity (a derivative fps in a sea of derivative fps games. Not terrible but you're better off getting doom 3)
Bionic Commando 2009 (A reboot of BC. You're better off with Rearmed)
Frozen Synapse (A tactical turn based game with an eagle eye view. Only get it if you have friends)
Mount and Blade (A neat little game that lets you wage wars and fight from horseback and shit like that. Looks like crap though until you mod it, at least the first one does)
Games that are bad, avoid:
Homefront (This makes bad FPS games look good, that's how bad this stinker is)
RUSE (You're better off playing any other RTS)