This show is no less educational then most of the shows on Treehouse. They are for young children, meant to teach about very basic things like treating others well, sharing, other types of social interaction and hygene etc. I find that this show does teach these things.
Maccapacca washes things and people. They are all different and different sizes yet they play together. Like making music the Tombliboos and Upsy Daisy work together and it teaches them to count as well. Also, the show is set up in a nice routine, where they play and then it is time to sleep and everyone does it. It helps me to put my daughter to bed.
It is a quiet soft show for getting ready to sleep. My daughter and her cousins all love it.
I don't see any downside. to this show. I think that "Little Bear" and "Franklyn" are good shows too and they are on very often, so I am happy to have some more variety in the programming.