South Park. Gameplay was pretty boring, and the legions of turkeys in the first few levels aren't really motivating for what's to come.
On the other hand, the weaponry was awesome. A chicken that shoots eggs, as your sniper rifle. Terrence & Philip dolls as grenades. In the PC version, the alt fire for snowballs, was peeing on a snowball, then tossing it. A toilet plunger gun, of which the plungers stick to whatever you've shot it at, and you can fetch and reuse the ammo for it that way.
It's not even a mediocre game, altogether pretty bland and boring. But nevertheless so goddamn awesome.