I just got back from seeing it with my two sons, and I enjoyed it. I was a little leery going in because of some of the changes I'd heard about (as a long-time comic book collector - as in "I have been collecting comic books for more years on the this Earth than not" - and there's a sobering thought, huh?) and a big-time Spidey fan, I wasn't thrilled when I heard that Peter was going to be generating webs from his own body, but you know what? It didn't bother me in the least. I also prefer the accidental bite from a radioactive spider - call me a purist - but I think they did a good job with the genetically-enhanced super-spider bit as well. My biggest disappointment was the look of the Green Goblin armor [insert Power Rangers reference here], but then I've never really been that big a fan of the Green Goblin anyway, so it didn't bother me too much. (Can you imagine if they used the real - and by "real" I mean of course the comic book version - costume for the movie? Let's face it, that would look equally silly.)
My main concerns were that they would do the Spider-Man costume justice - which they did, excellent job - and that they'd do a good job on the characterization of Peter Parker and company - which they did. (Loved that JJJ!)
I also liked the fact that they put in a lot of touches that probably didn't matter to the average viewer, but meant a lot to long-time fans. The fact that Betty Brant was there at the Bugle, even if she didn't play much of a role in the movie. The Albert Einstein poster in Peter's bedroom. The mention of "Eddie" at the Bugle. (Surely this is Eddie Brock?)
All in all, I thought they did a great job of keeping the spirit of the comic books. I look forward to the sequels no doubt already in the works.
And next time, I imagine we'll probably get a new villain. Any guesses? I for one think Doc Ock would make for a great movie villain - I'm sure the special effects department would have a ball with the metal tentacles - or, failing that, maybe Electro. My sons are hoping to see Venom, but I think there's too much backstory to do Venom justice without doing a complete rewrite on his origins.
I just hope they don't go the way of the Batman films and decide to cram multiple villains into each movie. That, in my opinion, was a really bad idea.
Johnathan