the game is gorgeous, and funny, and varied, and ultimately extremely satisfying. It offers substantial replay value via the now-standard Challenge Mode (in which you start the game over with all your weapons and collectibles, and earn point multipliers based on the number of enemies you eliminate without taking damage). Frustrating or not, it's pretty barren of dull moments.
It's all about balance, you see. And pacing. And A Crack in Time does as good a job of maintaining both as any Ratchet game GameSpy has seen in years.