So I finally got around to watching Kermit's Swamp Years after putting it off for, well, years, and...uhhh...yeah, it's...really...not good. It's extremely awkward and weird and not in a good way. The only redeeming parts imo were Jack Rabbit, his song, the little throwbacks to muppet canon (?), and Cree Summer as Pilgrim and Kermit's mom.
Granted, it's not as terrible as MWOO, but...yeah. It's not something I'll be rewatching anytime soon.
As for IAVMMC, it's incredibly flawed and dated, but I still find myself coming back to it now and then, mostly because of the second half of the movie. The stuff with Kermit/Piggy is really emotional and well-written and this is coming from somebody who used to be pretty 'ehhh' towards Kermit/Piggy. I still have my issues with the pairing, especially with how they're portrayed nowadays, but I honestly think that was one of the better depictions of their relationship. (That's a whole 'nother discussion, though.)