[Flashpoint]

Metal Slug for the Wii is fantastic if you like the Metal Slug arcade games (and I'm not just saying that because I made it).

BioShock is great. Not a whole lot of replay value, but a really beautiful and spooky game.

If you like RTS then Company of Heroes and the expansion Company of Heroes Opposing Fronts are the two best WWII games out there.

Orange Box is great for first person shooters. Call of Duty 4 as well. You aren't going wrong with either of those.

Role playing game is Oblivion so long as your machine is kick ass. Our hardcore RPG player at work says Two Towers is a really good one as well.

Or if you like MMO then go with HellGate London or WOW if you haven't yet.