Perfect Dark Zero is my favorite "bad" game. Not only was it my first Xbox 360 title, but it was my first XBOX title in general. I feel like despite the cheesy cutscenes/dialogue, wonky game physics (the physical copy, not the digital version), slow aim, and sometimes unfair levels/difficulty, there's a good game in there. Its by no means superior to the original or Goldeneye 007 (that's what the TimeSplitters series is for), but on its own... its a really fun title. Plus, the multiplayer lasted for a long-ass time before Halo 3 and Call of Duty 4: Modern Warfare came in and curbstomped every other multiplayer FPS out of existence.
Heck, the cheesy dialogue is so hilarious that I'm surprised no one's ever gone around quoting it like we do with the original six-movie Star Wars Saga.
"OH NO!! GOTTA RELOAD!!!"
"MOVE YO' ASS!!"
"Ain't gonna play nice? Gonna get my ball and go home..."
"No more Xbox for me..."
"KILL-HARMONIC ORCHESTRAAAAAA!!!"

And with the new game on the way, I've been very happy to be one of those morons that supported Zero long enough to get a new entry. I just hope its just as, or even more ridiculous as Zero.