The Man Called Thursday argues that the show's peak was the second through fourth seasons way back in the early 1990s, which was when Matt Groening lost interest and control shifted to the Harvard Mafia (as my former neighbor, a screenwriter on the meat and potatoes sit-com "Married With Children," called them with fear and loathing in her voice). I can't disagree, although the show's consistency held up well through the end up the decade. Were the Simpsons' 1990s the greatest decade any television show ever enjoyed? I'd say so, but lots of people would vote for more recent hour long drama on cable, such as The Sopranos. The funny thing is that drama doesn't hold up as well as comedy. Stations paid a lot of money in the late 1980s for the hour long dramas thirtysomething and Miami Vice, and never got their money back. Meanwhile, "I Love Lucy" is still playing somewhere right now.
The Simpsons Movie concentrated too hard on telling what we already knew -- the Simpsons may be dysfunctional, but when they pull together, they can triumph. I would have like to learn knew things. For example, we get to meet Nelson "Ha-Ha!" Muntz's mom. Why couldn't the backstory of other characters be covered?