I really would have liked to see this as an opportunity for something new, like Spider-man when he's a bit older for instance. Not that an origin story is bad, but it's something we've seen done before and there is a lot that can be done with this particular Marvel character that has never been seen on the big screen.
Spider-man 1 and 2 were really good and Sam Raimi is an excellent director. But from what I've heard, the script for 3 was pretty much forced down his throat, and he refused to be put through that again.