I really missed Sideshow Bob though.
It's strange. They advertised the fact that every Simpsons character ever was supposed to appear in the movie, but I didn't spot Sideshow Bob or Kang and Kodos (though my friend says he saw Kang listed in the credits). Maybe I just wasn't looking hard enough.
Still, there were a few good moments, but not anything that would make me want to purchase the DVD nor see it again.
There's supposed to be tons of unused footage, and theoretically the DVD will have it all. In one of the early screenings, Kang and Kodos made fun of the movie during the end credits. I wish they had kept that in, but hopefully it'll show up on the DVD.