I'd say the closest soulmate to Scott Pilgrim that came out this year was Enter the Void. If Scott Pilgrim feels like it takes place inside a video game, Enter the Void feels like a metaphysical pinball machine, bouncing the soul of the main character through different places and times in the past, present, and future. Both are impeccably directed, incredibly inventive films that are so cinematic and amazing that (for most, but not all people) the flaws in story and characters are able to be overlooked. Both are films that (finally!) utilize CGI to tell a story in a way that hasn't been told before, instead of to create ornate and fake looking worlds wholesale. I can see them both as being hugely influential to present and future filmmakers*, the kind of movies that make you expand your idea of how the power of cinema can be harnessed. These are films that couldn't have been made 50 years ago, or even 10 years ago, films that represent the singular vision of real artists.
Both (I feel) suffer from the story being told; Enter the Void with it's poor actors and despicable characters, Scott Pilgrim with it's rushed story and center relationship that's too slight to really care about. I feel that Scott Pilgrim puts a lot more it's weight on these problems than Enter the Void does, and suffers more as a consequence. But to discount the films because of these flaws feels like throwing the baby out with the bathwater. And you don't even need to throw out the bathwater, because there's a drain in the bathtub. Use that, and you will keep your infants a lot safer.
What was I talking about?
I understand if Scott Pilgrim didn't make your personal Top 10 (it didn't make mine), I understand if you didn't even like it (I really liked it), but to make condescending assumptions about WHY people would disagree with your personal opinion is narrow-minded and silly.** Debate the film, your problems with it, but trying to understand why someone would call Scott Pilgrim the best film of the year is like trying to figure out why someone would like the movie Clifford: it just spoke to them the right way, I guess.
*Filmmakers of the past, like John Ford, will probably remain too dead to care.
**Unless you're talking about Wilco, which sounds like every other alt-country band ever, and yet has a huge indie following. That emperor has no clothes and I feel like a crazy person for being the only person who realizes it.