I enjoyed it. Though, I really wonder about a sequal here.
I know that I went to see this movie, and I see probably a movie every 2 years at the theater (to give you an idea, the last 3 movies I saw at the theater before this was Star Wars Episode III (twice) and Shrek II.
I really believe there are other people like me that like the Simpsons, and went out to see it. Though I enjoyed it, I'm not so sure that I jump to see the next one, probably just wait for the DVD.