Well . . . this was almost exactly what I expected. It's funny, it has some quotable bits in it, and it has a joke that I really, really did not expect (during Bart's skateboard ride). It suffers a bit by overlapping things that have happened on the show (it's not even the first time Homer has destroyed Springfield with pollution!), but when you've got a show that's been going so long, that's inevitable.
There were lines I didn't hear properly because the guy behind us was laughing so loudly. And he was one of those guys that likes to repeat punchlines out loud, which was weird. Still, it's nice to hear people enjoying themselves.