I think that it was alot easier for a true fan to be dissapointed. But you must understand, so much was expected it was bound to let some down. There were severel inuendos and such that were made that the hardcore fans will love, but not everyone will pick up on everything. Overall the team did a great job. For me I was really dissapointed that Conan Obrien was shunned by the film. He wrote some of the classic episodes such as Marge Vs the Monorail, set aside time to work on the movie, and then was never contacted. Lame.
Yeah, Conan is one of the great, under appreciated writers/comics imo. He started at Saturday Night Live, and they screwed him there too, right?