Storyline is great. Brilliantly funny with some of the best characters I've seen in games for ages. However the story mode only takes about 4 hours to complete. Lots of side missions, however all are nearly identical (based around a few different scenarios, e.g. racing, fighting etc), so not worth doing unless you want to waste your life boosting gamerscore.

First off, you need to NOT take that game seriously. It doesn't deal in that. It's meant to be funny and in that, it really succeeds. Voice acting is a strong feature here and gameplay is pretty cool. Be sure to not let your epileptic kid play this one though, as there are a lot of lighting effects involved :)
Overall a real fun experience, though I have to agree that's it's a little repetitive. But for once that serious developers go for something trully original, I'd say it's worth it. Excellent soundtrack.

I thought the sound track was brilliant however, the game was terrible, awful story line and repetitive.