Still thinking over here...here's my thoughts.
It wasn't the plot, actually, that bothered me. It was the way our well-known characters were manipulated to further that plot--even when it seemed out of character--that left me feeling dismayed and disgruntled around the edges. For instance....
Kermit being replaced by Constantine could have had a million small gags running throughout the movie, culminating in a big, group Ah ha! moment. Originally, Dominick explains Kermit's voice difference as a cold. Wouldn't it have been more insidious (and villainous) to suggest that Kermit's not quite the performer that he used to be--he's gotten rusty and his voice isn't just isn't up for what it once was. This could be told (one at time) to his closest friends--Piggy, Fozzie, Scooter, Gonzo, Teeth--in a confidential manner, and never in Kermit's hearing. His friends could have been cautioned about mentioning it to him (or to each other) because it would make Kermit feel like less of a performer, a has-been. This whole string of conversations could have been filmed in next to no time, with Dominick telling the story once, but having the muppet he's telling it to shift so that it sounds like one explanation, but the audience would understand that it had taken place several times. This would have played right off the last movie, which MMW obviously has no problem doing. That way, even when Kermit's friends noticed that Kermit was off or odd or something, they would have kept it to themselves out of affection and loyalty--NOT because they were too stupid to notice the difference. (grumble, grumble)
This idea would work equally well to explain Kermit’s fainting from stage fright, his desire to appease the rest of the cast in ways he never had before and his making up to Piggy. Kermit’s friends would see Kermit trying hard to please them—perhaps as a way to make things up to them—and wouldn’t comment on his loss of masterful leadership (ahem) because they didn’t want to make him feel bad.
Walter could still have been the voice of doubt, saying, “Um, guys—was Kermit always like this?” and getting hushed and shushed for pointing it out. Likewise, Animal could have been chastised for “picking on the frog when he’s not himself.” (rim tap please)
There were soooo many missed opportunities here that had nothing at all to do with budget or performers or time—they had to do with the script, which could have been both more cleverly written and truer to the characters. I won’t go into a big diatribe about it, but I will admit that I was appalled—appalled!—to hear Nick Stoller say in an interview that he loved writing for Fozzzie “because he’s so stupid.” I think back to the complicated puns that Fozzie came up with, the telephone gag, the way he rationalized with Kermit about his act and I don’t see stupid—I see naïve and unworldly. If Fozzie doesn’t seem like his old self, it may have something to do with the fact that the script considers him an imbecile. Likewise, Gonzo has a couple of good lines and the indoor running of the bulls rang very true, but Gonzo has also been hailed as the “soul” of the muppets. In MMW, he and Camilla share one show-idea scene and are virtual strangers the rest of the time. Contrast that, won’t you, with Gonzo blissfully asleep in the rafters of the old Muppet Theater with the chickens, or with Camilla’s wise and knowing encouragement of her weird lover's secret dream to get back into his spandex. I also felt that Floyd Pepper really had some nice moments in the last movie, especially with Animal, and he and the rest of the band-members are sort of consigned to the masses who just want to do what they want to do. If we go with the idea that the Muppets just got back together after a long time apart, don’t you think they’d had quite their fill of doing whatever the heck they wanted? (And, as Dr. Phil would say--How's that working for you?) Wouldn’t they want to come together and bond as a performing family? Wasn’t that why they all came back together in the last movie?
I do not wish to spoil anyone’s enjoyment of the movie (and, knowing muppet fans to be independent and imaginative thinkers, I don’t for a minute suspect that I can seriously impact anyone else’s opinion) , but I am interested in thoughtful dialogue. I have really enjoyed reading what others saw and liked in the movie—it gives me things to look forward to when the movie comes out on dvd—but I also want to understand my own point of view and why this movie left me feeling very different from the last one.