Yes, there will be spoilers, so if you haven't seen the movie, yet, I suggest you stop reading right.............................................. now.
These are a couple of things that I've said in another forum:
"I liked the movie. The first movie was better, though. First movie was about the transition into becoming Spider-Man. Second was about the trials and tribulations on being Spider-Man. Third will be about revenge. The reason people didn't like the sequel was because it focuses on Peter and his ongoing struggle as Spider-Man. I've been a Spider-Man fan since the cartoon that Wilibus is talking about started. People complain about how it was too focused on his struggles as Spider-Man, but if you've some knowledge from the comics, then you'd know that he goes through much more in the comics.
Raimi did a pretty fine job portraying Peter's constant battle within his mind. Spider-Man or not? Also, Peter lost his powers for a period of time, so he had to stop being Spider-Man sooner or later. Even though that shouldn't have happened until later on, it fit quite perfectly into his not wanting to be Spider-Man, anymore. A movie about his constant struggle was bound to pop up, anyway, and it's a good thing it's the second movie, since the third should be incredible, as it is a struggle between two best friends.
As for the acting, I didn't notice any bad acting at all. I noticed many flaws on acting in the first movie, but little in this movie. The part in the sequel, that I can remember, with bad acting was during the train scene when that kid tells Spider-Man that it was good to have him back. That part made me cry because the acting was so bad. I was expecting Peter to say something like, 'It's good to be back, kid.' Other than that, I didn't really notice any acting flaws."
"I also noticed the flaws in the CGI. They were just nowhere near as good as the first's. I was watching a behind-the-stage special on Spider-Man 2 on MTV and they explained why the CGI wasn't as good as the first's. They said that CGing was very expensive and whatnot.
I also agree with the last battle. The train scene was great, but second to last battle's aren't supposed to be more suspenseful than the last. The last lasted 2 minutes, for God's sake. What's worse is how Octavius died. He's supposed to be a recurring villain. Damn you, Raimi! There's supposed to be a gigantic villain team-up, which would surely have Octavius.
About characters that haven't been introduced, it's a shame that Gwen wasn't added in. She's supposed to be killed by Hobby after Peter's identity is revealed to the Hob Goblin. Her murder is supposed to have a major impact on Peter and how he can never have a love life. Raimi can't do that with MJ because she has such a big role. Another thing that nags me is how Eddy Brock hasn't been introduced, yet. Raimi couldn't possibly fit in the ruination of Eddy Brock by Spider-Man and still have time to explain Venom in just one movie. It's ridiculous. He should've been introduced in the very first movie."
What boggles my mind is how they're going to have a movie with a super hero who has a "secret identity" that's known by 30 people. Harry, as the Green Goblin, could also tell many more people.