I don't know, when I first saw The Simpsons Movie I thought it was great, but when I watched it again recently... not as much. The plot, the jokes, Plopper, etc.
I still
love it, but I do see some of the flaws. For one thing, much as I loved the "whacked-out-Armegeddon" type plot, there was a bit too much of it and not enough intimate, emotional scenes WITHIN THE SIMPSONS family. They tried SO hard to include every character in the town (Even Cletus got a pretty major role!

) that it kinda felt like the family came second.
Bart also forgave Homer WAY too easily. Homer: "I'll let you hold the bomb"---Uh, WHAT??? And be the first to get killed if it goes off?

It just didn't feel real to me.
Also, as "big" as the crisis Springfield faced was (and I loved the whole HUGE nature of it) it just wasn't big enough.) It should have been leaning torwards the "Weirdness" of a Halloween type episode--where REALLY big things happen, time travel, earth in danger, etc....maybe not quite that off the wall, but more in that vein.
Also, (and I think Ben said this earlier), we could have used more references to the fact that it's "The Simpsons on the big screen" after 18 years, maybe some self-referential jokes like that.
(Ex: How about them accidentally meeting their Tracy Ullman selves somewhere? Like that shop where the "other" Simpsons family gets arrested?

)
Or a Critic, or Matt Greoning cameo? Or some reference to the fact that it's an ANIMATED movie....like, oh, here's an animator drawing part of the scene, etc....There were a lot of those in the series, surprised there weren't any in the movie. (I really thought there might be, especially after that CGI/Bunny initial teaser.

)
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But I still love Spider-Pig!!

And the "epipheny" scene was just AWESOME on so many levels....We REALLY needed more scenes like that. Just weird, whacked out stuff that challenges you.
And nothing in that movie was as emotional and touching as Marge's video farwell and when Homer runs out of the cabin.....

You can’t just have your characters announce how they feel! That makes me feel angry!