In a word...AWESOME! First of all, you should just see this because it is a good movie.
But if you have ever played video games and liked them, especially games from the eighties and the nineties YOU MUST SEE THIS.
The basic plot has been plastered all over the internet, but I'll summarize. Scott Pilgrim finds the girl of his dreams (literally) but to date her he must defeat seven evil Exes. This is a world in which video game physics rule (except for cracking open barrels and randomly eating stuff from them or breaking into people's houses and stealing stuff and...well...OK, SELECTIVE video game physics) and Scott's membership in a small indie band and his video game fighting skills come into play again and again.
The graphics are neat.
The homages to ancient video games are neat.
The character dynamics are actually quite interesting.
But the reason you need to see this is because it is also the FUNNIEST damn movie I have seen in a long time. It actually hurt to laugh. That hasn't happened in quite a while.
I can't recommend this movie enough.