I didn't have a problem with his acting. I didn't say anything about his acting. I had an issue as his portrayal as Peter Parker. But there were issues with the script as well.
I agree with you. My main problem with Peter in this movie is that his characterization is all over the place. Peter Parker is supposed to be awkward, dorky, uncomfortable in his own skin 99.9% of the time until he puts on that suit and is free behind the mask of Spider-Man. That's when the witty, sarcastic, confident Peter comes out.
In this movie, he mostly flits between being witty, smooth with Gwen, and snarky and confident. There is no "real" Peter Parker in this film. He doesn't feel like the Peter I grew up with.
With that said, I really liked the movie, once it got past the annoying origin part. I didn't think it matched the comic books in terms of tone, but I did feel the animation team absolutely nailed the look and feel of Spider-Man and his moveset. I loved it, and it was right out of the comics. It didn't even particularly feel like the Ultimate Spider-Man comics either to me.
Overall, I'd give the movie a B-, if I had to grade it, and I still think Sam Raimi's first two Spider-Man movies captured the world and feel of Peter and Spider-Man better than Webb has in this outting. I'm still looking forward to ASM2, as I'm a huge Spider-Man fan, so more Spidey on the big screen is welcome.
I actually thought the cast in this movie was great (just because I didn't think Garfield acted like Peter, doesn't mean I think that he's a terrible actor). Garfield is a talented actor, and his post-spider bite Peter is a lot more in line with the comics than his pre-spider bite Peter. Emma, Martin, Sally, and all the rest did a fantastic job as well. I think the cheesy, camp factor that should be in all Spider-Man stories was there, but I felt the teen angst was a bit much.
I did enjoy the movie, but not as much as SM1 and 2 (I'm one of the few that actually enjoyed SM3 for how ridiculous it is, but I'd put ASM behind SM1 and 2, and before 3). Something about SM1, and the way Raimi organically introduced the elements of Spider-Man lore into the film felt more natural. ASM felt forced, especially the first 30+ minutes.
I'll definitely be picking this up on Blu Ray at some point in the near future. Maybe next week, or something, I don't know. I'd like to watch it again.