Just saw it today and enjoyed it quite a bit. I've never read the graphic novels, so I'm fresh eyes to the material other than what little bits I've gathering in passing from the internet.
My inner video game nerd loved the fight sequences, some of the jokes sprinkled in and some of the music selection. The 8-bit "Universal" logo opener was a great way to get started.
My only beef with the movie, and it's not really a huge one (although I'm about to make sort of a deal out of it for the sake of conversation) is the fact that large portion of this movie made me feel like I was watching something that I was slightly too old for. Not an uncomfortable feeling... just something noticeable in a way that I've not experienced before. But now that I'm thinking about it I imagine that perhaps I might have felt this way watching Napoleon Dynamite as a 30 year old today instead of as a 24 year old 6 years ago.
I've read a few articles recently about "Generation Y / The Millennials" and one thing that I've found interesting as a common characteristic about this generation is the delayed transition to adulthood. With previous generations, the rites-of-passage into adulthood took place between 18 and 22 as many people were expected to graduate highschool, move out, get jobs, go to college, get married and start quickly moving toward buying a home or having children. With the Millenials, these "goals" are often pushed back, and either as a precursor or as a result, adolescence (or at least adolescent tendencies) is almost unnaturally lengthened.
Of course, speaking in generalities is all you can really do when talking about trying to define a group as large as an entire generation, but if these generalities have any truth to them, then I sort of see Scott Pilgrim as a character that embodies these notions. He is a 22 year old boy with the mindset of a 16 year old. He's only moved across the street from his parents' house, he's dating a high school girl because he like the simplicity of the relationship, he has no motivation beyond living in the moment, and the biggest rollercoaster in his life revolves around dating drama. Of course, there's a bit of character development that takes place right around the end of the film, but up until that point I couldn't help but wonder to myself... should Scott Pilgrim REALLY be doing the things he's doing as a 22 year old? And I don't mean that in a "darn kids get off my lawn" kind of way, but more in a "someone needs to put that baby bird back in the nest" kind of way.
Anyway, again... not a dealbreaker for me as I still enjoyed the movie quite a bit... just something that stood out to me as feeling a little strange.