Just watched the video that was posted in this thread...it was all right. More cons than pros for me.
First, I really think that the Muppets' vocals were prerecorded. Kermit's intro in the Rockefeller show is exactly the same as the one in the music video. If Steve were speaking live, he would have stopped while Cee Lo did his little shout-out. With prerecorded tape, the Muppeteers don't have the option of stopping mid-performance. They have to keep going, even if someone is talking over the prerecorded track. And that's why I dislike lip-synching to prerecorded tracks.
Second, I didn't care for Animal or Miss Piggy too much in this song. Animal wasn't his hyperactive self, and Miss Piggy seemed slightly reserved/restrained. If I'm hearing correctly, Animal is the one taking up Mahna Mahna's role. But Animal was basically statue-esque throughout. Plus, Miss Piggy didn't get in any smart remarks, which is the essence of her character. Pepe, Kermit & the Snowths were the only one that were fun to watch, in my opinion.
Third, Cee Lo's outfit...
he looks like a giant tomato in that getup. Like the Fruit of the Loom commercials with the singing men in fruit costumes. LOL
I definitely prefer the Rockefeller appearance when Dr. Teeth & the EM sang "Run Run Rudolph." Also, the Jimmy Fallon appearance was funny, too. Those two are WAY better than this one.