I was not expecting clever dialogues and stories worthy of the earlier seasons, but what I did get was pretty durn good. A big, bold epic story that starts off with Springfield isolated from everyone on Earth to having it almost blown up is exciting enough (and possibly hard to top for future Simpsons episodes), but the writers did a bold, tremendous job giving side plots for each of the Simpsons family.
Bart seeks solence in Ned Flanders (who, thankfully was into his more early season self then the strict bible thumper they made him in recent ones) for a proper father, Lisa finds love (her personality also more like her earlier seasons with her protesting nature not as forceful as the show usually makes--her punching Bart in the face garnered a "YEAH!" out of me)--though I felt this wasn't emphasized well enough, Maggie...doesn't do much, but even she gets her moments, and Homer and Marge, while going through yet another marital issue dealie, felt real and honest--seeing the tear-jerking Marge's video was absolutely heartfelt (even better with Julie apparently having really choked up when she recorded this). Not to mention even some of the secondary characters had their motions (who didn't cheer when Martin finally got his justice?), but no Sideshow Bob? Blasphemy! New characters Russ Cargill was absolutely hilarious, but medicine lady, despite moving Homer's character, was a pointless addition.
Some jokes and gags fall flat, but others made me laugh and that says a lot of the many cartoons on theaters which can't even attempt humor even if they tried. I also loved that the story generally flowed pretty well and how certain elements later played a vital part (the motorcycle, wedding tape, sinkhole, etc). And the animation is gorgeous with minor irks here and there.
In short, it's not perfect, but it's great and that's good enough for me.
8/10