Like many other reviewers, several of the tasks were repetitive, but not that bad. I had not planned to keep the game, but in the end, I had quite a bit of fun and adventure doing it, that it's going into my Xbox 360 collection (which consists of Halo 3, Beautiful Katamari and Mass Effect (a Christmas present from Peter))
It was quite a ride. I would recommend it.
It's heavily story-based, so if you're not into that kinda games, don't do it.