Somehow I didn't like the PD controls as much as GE's. Aiming at enemies was a lot more fun in GE. GE also had nicer levels. But Perfect Dark had better enemies and more gadgets and weapons. Plus a cool storyline and (decent) voice-acting.

Best of all: the multiplayer with bots. But I still miss the bunker level from GE...
Too bad my friends never wanna play GE anymore, it's just PD, WC98, ExciteBike 64 and Mortal Kombat Trilogy.
