One thing I've noticed about the show is that, while The Muppet Show and Muppets Tonight allowed many of their guest stars to show off talents that they weren't known for, it seems all of the guest stars on The Jim Henson Hour did what they were known for and nothing else. None of the non-singers got to sing on the show (though it seems most episodes only had two full musical numbers per half-hour), for example. Most of the guest stars were singers, and I guess they did get to act a little (mainly in their interactions with other characters, most of which weren't exactly sketches, more like honorary talk spots), though I don't know whether many of them were known for acting as much as singing (Buster Poindexter seems like the kind of music performer who could have been an actor/comedian as well as a singer).
And it seems most of the guest stars were mainly popular for a few years in the 1980s and 1990s. Obviously Ted Danson and Smokey Robinson had been stars for a long time and continued to be stars after, and the Today show people were kinda bigger (though their fame seems to be limited to Today). By comparison, many guest stars on TMS and MT had been stars for many years and continue to be famous today.
In Jim Henson: The Biography, it says that Jim Henson wanted each show to be themed around some kind of educational topic, though I never really got the sense of that. I can see Fitness and Oceans having an educational feel, maybe also Garbage, but for the most part MuppeTelevision didn't really feel like an educational show.
Jim Henson: The Biography says that critics were most harsh to the MuppeTelevision segments. Considering some of the stuff mentioned in the book, I have a feeling that MuppeTelevision would have also failed if it was all original characters, and maybe even if it was mostly familiar characters. The format seems like it would have worked on MTV, Nickelodeon, or Adult Swim, though. I can't believe that the biography mentions that critics also disliked Jim Henson's introductions, calling his performance "stiff". I feel Jim did a good job in his intros. His performance seemed natural to me.
I keep saying that the first two episodes were poor choices for being the first two episodes because they seem to only focus on Kermit, Digit, and to a lesser extent Lindbergh (and to an even lesser extent, Waldo in the first episode), while other episodes seem to have a good balance of other characters throughout the show. Not just because they are two of the episodes with the biggest lack of classic characters, but in both episodes the other characters seem to just show up for one scene (and in the first they all get back together for the closing number, including some characters who weren't in the episode earlier). But something hit me about this regarding the first episode: with the exception of Bean Bunny having a featured role in the Space Guy sketch, none of the sketches star or feature any of the shows intended main characters (unless the Extremes were intended to be major but weren't). All the other skits have really minor characters who were barely seen again, before or after. And with the exception of Neutron Dance, all of the sketches feature human actors as well. Oceans did a little better in this regard, casting Gonzo and Leon in the pirate sketch, and having Clifford narrate the closing sketch (and also having Rowlf star in one sketch), but even with more use of the shows main characters I feel that was one of the weakest episodes of MuppeTelevision.