God help me....I might get crucified for this, but....I didn't like The Muppets.
Okay, hear me out!
Your words.
Better than Muppet Wizard of Oz is a good defense, because most likely, we would have ended up with a movie exactly like that. D list at the moment celebrities being forced in, nipple jokes...just lazy, cynical, below Family Guy type humor. And even then, that's if Disney even wanted to make a Muppet movie. We all seem to forget, if it wasn't for the "fan fiction" writers, Disney would've probably just bought the rights to some old cartoon and made a movie that has nothing to do with the original show. And NO ONE would have cared, as the remaining fans of said cartoon would find it blasphemy, and no one under a certain age has ever heard of it.
Think of it this way. You have this life long dream of making a movie with your favorite characters. You get that opportunity. You throw in as much stuff as you think the fans like, and you essentially have a deep connection of what the fans want and don't want. You think you've done a favor to the fans and then someone says "Nyeehhhh, Nyeh-I don't like it" because it doesn't measure up to something it need not measure up to. That would suck, wouldn't it?
Let me expand the field. Say you're making this thing you think is a beautiful fan tribute in a field of cynical cash grabs by studios who bought up rights to films and only make said films because the options are about to expire. Sloppy, terrible films like Marmaduke, Garfield, Dragonball... name a kid's film based on a cartoon franchise. Not only are you trying your darndest not to fall into that field, you insist that you're trying hard to distance yourself from all that, when everyone else just lumps you into the same group. That really would suck, wouldn't it.
I'm not so much defending the movie, but defending the fact that if it wasn't for said movie, the entire franchise would have died. And as much as classic fans like classic things, we'd have to resort to watching beat up old VHS's.