I have actually beaten almost every game i rent. Beat fallout 3 (main story + a lot of sides) almost beat mercs 2 but 360 broke, beat the NFS games, (not undercover yet)that's a great way to choose between the games It all depends on how long you are renting for and how long you plan on playing it because L4D is short but that's a good thing (you don't want to rent a game and not finish it)