My friend just called me, with his review of Spider-Man 3. I really trust his opinion more than anyone else, and he's done reviews for all of the geek film sites.
He says that despite the villains, that they managed to really resolve everything by the end and the climax is amazing. He said there's a weird interruption by newscasters, which he thought was kind of "meh", but the climax is so off the wall - you won't care. He says there's too many characters running around, like the "blonde chick" (he's referring to Gwen) and that Cromwell got no screen time. He also said there's a musical number in there that I'll find hysterical, but he's not sure how it'll play with your average crowd. Overall, he really, really liked it - one of the better popcorn flicks he's seen in the past two summers, but that it is not as good as Spider-Man 2. Says this is like the original, where if you want to pick it apart, you can.