I never heard anything about Spider-Man 3 originally to be two movies. Where'd you hear that?
It does, however, have far too much going on, and Raimi hates Venom and didn't even want him in the movie. He was forced by the studio to have Venom, and that forced the movie to go all downhill because I don't think he was trying too hard.
Anyway, I wish the Star Wars prequels didn't exist. They should have never been created, and all three of them are simply dreadful. I just want the original untainted trilogy, on Blu-ray, with a really freaking nice transfer, without any of the special edition crap. Robert A. Harris has even offered to restore the films for free... They could make a fantastic 1080p AVC transfer from that.