http://forum.newsarama.com/showthread.php?t=111390

Pretty spot on really. The action, fight scenes, and special effects were the best of the series. The corniness was the worst of the series. Spider-Man dancing in the streets, and then to Mary Jane? Cuts to people in the crowd during the climax of the movie? And that scene with J. Jonah Jameson and the little girl? What about Stan Lee's God-awful cameo? I can't say much more than what the review says.
After seeing it once (I want to see it again for sure though, b/c I think seeing it at midnight with all of the nerds took some away), I will say that it is the weakest of the trilogy.
When I walk away from a movie and remember the shitty parts just as much (if not more) than the good parts, then something didn't work.