Okay, I just saw the movie. My feelings are mixed. While it's an utter delight to see the Muppeteers (Jim: Muppet PERFORMERS!) back on the big screen, something about this movie felt off.
Honestly, I think it was the celebrity cameos. It seemed less like "Oh, isn't it awfully funny to have these actors interact with these Muppets!" and more like "Hey, if you like the Muppets why not check out our array of marketable Disney-Owned Pro- I mean Celebrities!"
It was like the writers and Muppeteers were trying to do their best DESPITE Disney.
The Celine Dion cameo was ridiculous. It just did not need to be there. That was Piggy's song. We already had her sing all those Celine Dion songs earlier, too. (That's another thing that bugs me. Actual popular songs used in the film. It works on TV, but here it just reeks of contractual obligations. I had the same feeling about "We Built This City" in the last film.) They kept shoe-horning her in there, too. She distracts from Piggy's moment, and then she's up front with Piggy in front of the Muppet chorus, and then comes back AGAIN with sparkles no less, right at the end!
It's like there are two plots going on. The movie, and Disney's marketing department. It's like The Muppets are solely being used to advertise the company's other acquisitions. The Muppets are no strangers to advertisement, but it shouldn't be in a major motion picture. It just gives off bad "Lady Gaga Ambiguous Satanic Holiday Special" vibes.
Apart from those gripes, I think the Muppeteers did a fantastic job and it was clear that they had a lot of fun performing, and they accomplished some nice puppetry feats, too. Constantine was the best part of this movie, and I especially love his character in interviews. (Iyy am Ryann from de Mappet Mindseeeht!) And going back to Piggy's musical, I think Eric Jacobson did a fantastic job. And you definitely feel all warm and fuzzy when he sings "A little pink frog and a little green piggy". It was just adorable, ******!