I personally hate every Muppet movie from "Treasure Island" onward.
Oddly enough, I never got to see the full film "The Muppet Movie" when it first came out, so I never got to see the final part of the movie with the Muppet chorus including the "Sesame Street" Muppets including the final appearance of Herbert Birdsfoot in an original Muppet presentation. Even then, the most I would have identified, in terms of "Sesame Street", would have been Big Bird, since he stood out and had a speaking part.
I did, however, see the films "The Great Muppet Caper" and "The Muppets Take Manhattan", in their entirety when they got released to theaters.
However, I find it amazing that "The Muppet Movie" turned 40 years old last year.