I came out of the movie house thinking Spider-man is no superhero, not the bigger than life superhero kids look up to. I thought to myself, if I were a little kid, I would want to be Harry Osborn or the New Goblin over Peter Parker or Spider-man anytime. But, maybe that's because I am female. Must be why Harry Osborn couldn't be Peter Parker's best friend in any succeeding Spidey movie -- you just would pick him over Peter Parker. Well, a girl would. :)
Enough said, I enjoyed Spider-man 2 much better. But, if you saw Spider-man 1 and 2, you should still see 3. It's still worth watching. The Sandman effect is cool. I liked that one too.