Watched in a discord call and I really liked it. It was funny, heartwarming, and I liked how they blended all of Henson's shows. All in all a perfect way to get into the christmas season.
That said, there's one thing I need to address, hence the spoiler tag.
At the end of the special Kermit gives Miss Piggy an anthropomorphic female mink as a present, and the mink says something along the lines of loving Miss Piggy. That means Kermit pretty much gave Miss Piggy a prostitute as a Christmas present.
So yeah it was good.