Just got back into town...
Overall the move is pretty good, keeps your interest for 88 minutes. There have definitely been funnier episodes on TV and you even have Homer mocking the audience in the beginning of the film for paying to see something they can stay home and get for free.
Still better than most other films as far as writing and visuals, and for me seeing the attention to detail in the drawing was cool. For average fans, I'd say wait for video (especially if you have HD or widescreen tv at home), for Simpsons addicts or non fancy TV owners, I'd say go see it.