There was something really cool about watching a big-budget Simpsons adventure in a room of hundreds of other people, when before it was just me and my dad watching for years and years on the small screen. I'm as big of a Simpsons fan now as I was 10 years ago, so to say I was excited for this film was an understatement. My heart nearly stopped when
the Homer "S" teaser suddenly played in the theater. I watched any and all clips of it that were released online over and over. Even being 16, I knew the Simpsons was far past it's prime, but the jokes all seemed so funny and clever. "Mush! Mush! Jump! Jump! Rest! Rest!"
Ultimately, even with my excitement I thought the movie was a solid 7/10 at the time. It was much funnier than the standard episode then, and had a lot more emotional components largely missing from the show at the time. Marge's break-up tape, and the Flanders/Bart developments followed by his reconciliation with Homer were really hard hitting emotional moments. The comedy, while on repeat viewings wasn't as sharp as heyday humor, was a huge crowd pleaser and perfect for full theaters. I'd put any of the following sequences/gags up there with any classic moment for sure:
Homer's Chores
Simpsons go to Church/Grandpa's vision
Bart's naked skateboarding
Flanders Hot Cocoa
The entire mob sequence
Homer and Marge's "Disney" scene
The entire bomb/dome sequence
Lot's of good stuff in the film for sure.
But ultimately the movie suffered from trying to check every box and give every Simpsons character a plot thread. The father/son story that they developed with Bart and Homer was the strongest thread by far, but it's real estate was consumed by the Homer versus springfield, Homer and Marge's 900th marriage crises, the Lisa/Colin thread which was a waste, and the hit and miss EPA Cargill dude. Less would have been much more in this case, but I'm sure the production convinced themselves that this film had to please everyone as the first official movie.
I hope one day they attempt this again with less baggage. The recent seasons have shown they still have great stories to tell with the humor to boot.