Oh, I agree with you on that, to a certain extent, as the third Spidey film was definetly watchable, and enjoyable. My problem was similar to yours almost, as I also found it a letdown because the writers could not make up their mind on what they wanted to happen in the third film. And because of that, the story was filled with small holes, making some scenes peculiar beyond belief.

Also, I had a problem with the villains, as Venom was a letdown, and Sandman was simply unnecessary, that is because Venom was in it.

Eh I still don't get the hate for Spidey 3 (at least half of the movie is pretty good). Venom did feel "designed by committee," but the real problem was in juggling so many different sub-plots.

I still thought it was decent, though definitely a letdown.