I sort of agree and don't. The movie is terribly dated in tone, but there are nuggets of pure Muppetiness through the film that manage to shine through. I'd say this film is the exact moment Steve was comfortable with Kermit, and he managed to have that nice balance of sweetness and frustration that was missing from most of the projects before. Especially MFS, where Kermit was just there for licensing purposes and felt like he was lobotomized the entire film. The moment between him and alternate world Piggy brought back the sweetness of the Kermit/Piggy relationship that was long lost.I understand Simpsons are really cool and all, but you have to keep in mind, the Simpsons and the Muppets have two very different styles of humor, and you can't really expect writers from to try and write that kind of humor for the other and vice-versa. Simpsons humor doesn't work with the Muppets, and I doubt Muppet humor would work with the Simpsons unless they did it intentionally in a parodic way. Not to mention, as Drtooth has mentioned several times before, just look at all the pop-culture references that are painfully outdated now. And yes, I'm aware MOZ had similar problems with adult/Simpson-esque humor, but it was a bit more stealth that time around.
But above all, the movie was made back in 2002. Well before everyone started hating the Scary Movie franchise. And the film takes all its humor from there. It's basically Christmas Movie with The Muppets at points. And there are some great moments (The Mel Brooks Sam the Snowman expy, the Gift of the Magi reference...a double reference as a different set of Muppets did that before) and some ones that are just painful (the whole Fozzie segment could have been cut in half, and that NBC plug for Scrubs written with absolutely no research) and ones in between (Moulin Scrooge is dated as frak, but that movie was such an overrated piece of epilepsy, it gets a pass from me).
MWOZ I feel the opposite. I could go on for pages about what's wrong with the darn thing, but the most glowingly obvious problem is that it so wanted to be VMX. It dressed like it, it talked like it, it went to the same stores and ate the same thing, but in the end we got someone poorly dressed talking slang uncharacteristically, and was so far removed from an imitation, it managed to be completely different by doing the same things, and poorly at that.
I'd say out of the two, as negatively as one can express for either, VMX was a necessary weasel. It just doesn't play well much anymore.