This movie wasn't very good, but I was still extremley entertained.
Many of the plotlines were underdeveloped, and overall there were just too many of them. Peter's "black suit" storyline wound up being silly. They could have done a lot more with it than make him dance in the streets and act like an obnoxious idiot. I thought he was an obnoxious idiot before he was possessed, so it didn't really change very much in my eyes. I really did not like Peter in this movie at all, and I think they messed that up. Peter is supposed to be a lovable character, but in my case, I was rooting for Harry to kill him. I'm pretty sure you're not supposed to root for the hero's girlfriend to be with his 'evil' best friend, but oh well. I did anyway. I think James and Kirsten have A LOT more chemistry than T/K, and I actually found the MJ/Peter scenes pretty dreadful to watch.
Harry/James saved the movie for me. Every scene he was in was an enjoyable one, no matter what was happening. The final action scene where him and Spidey team up was a lot of fun to watch. Oh, and Topher Grace was awesome for the few minutes of screentime he actually had. I don't read the comics, so I don't know how prevalent a character Venom is, but personally I would have liked to see more of him.