Director Sam Raimi doesn’t take it personally if you thought Spider-Man 3 was awful, because he completely agrees.
During a recent appearance on the Nerdist podcast, Raimi said, “I messed up plenty with the third Spider-Man” calling it “awful.” He also noted the following:
It’s a movie that just didn’t work very well. I tried to make it work, but I didn’t really believe in all the characters, so that couldn’t be hidden from people who loved Spider-Man. If the director doesn’t love something, it’s wrong of them to make it when so many other people love it. […]
I think [raising the stakes after Spider-Man 2] was the thinking going into it, and I think that’s what doomed us. I should’ve just stuck with the characters and the relationships and progressed them to the next step and not tried to top the bar. I think that was my mistake.
He goes into more detail on the podcast, but I think it says a lot that he’s willing to look at his work critically and continues to strive to do better.