The problem is that the show was rushed out the door, fundamentally. I'm sure if it went on one more year they would have had solid writing that the show was lacking until the very last episode. I really like the show and all, but sketches and plots that worked REALLY worked, and ones that didn't REALLY didn't. Whereas the Muppet Show has an occasional sketch that felt weak or just didn't work on some level or something, when MT had a bad sketch it had a BAD sketch. I.E. Bay of Pigs Watch. I have to say, I blame the Pigs. The fact that most of them (other than Andy, Randy and Piggy) were just one dimensional parody figures. Granted, they would have been funny if they were used once or twice... but they were recurring.
I repeat, the worst of it is that the UK only skits were arguably the best (recurring) segments. Why we didn't get to see Polly Lobster and Clueless Morgan in the actual show is beyond me... I know Kevin's too busy with Sesame Street... but they really should have kept Clueless Morgan around (one of the best looking new characters).