The best games to buy are the used games at Gamestop. D:
Of course if you want to play a first person shooter you can play black for the PS2 or Call of Duty Modern warfare 2. You shouldn't buy games that look cheap on the cover (except for nintendo games.)
Friendly warning to all: Do NOT buy/rent Naughty Bear. Minutes of doing the same thing over and over again will get you bored.
If you're looking for shooters you should get Battlefield: Bad Company 2 if you're into full-scale battles, and destructible landscapes, or Modern Warfare 2 if you're into the small-scale intense skirmishes. If you like free-roam adventures you should get GTA 4, or Red Dead Redemption. I recommend Red Dead Redemption over GTA4.