Re: Most disappointing comic-book movie
The way I view it, a disappointing film is one that looks good but isn't, or is at least not as good as your expectations. TASM looked bad and was bad. While that is disappointing in the sense that you don't like to see a great character like Spider-Man get butchered like that, I don't really think that is what the question is asking.
To me it is the opposite of most surprising film. TDK was the best superhero film of all-time, but it was expected to be so that isn't surprising. Surprising is something like X-Men: First Class which came after a string of failures from the franchise and didn't look particularly good from the promotional materials, but was quite the excellent film. Surprising is a film that exceeds expectations, disappointing is one that fails to meet them.