Just brilliant. The visual style is unequalled: hand drawing and wet media meet computerized rendering in a uncommonly successful merger. The social message is about tolerance at many levels, to the point that skin color is the least of the issues. Characters have some depth (maybe not all that much, but some) and really make you want to like them.
But, at least one serious irony inflicts itself, and in multiple ways. The Alldunns, the self-proclaimed higher caste who identify themselves by their fine rendering, elevate themselves above the mostly-finished halfies, and everyone abhors the loosely-drawn Sketchies. Well, declaring yourself superior based on some trait over which no one has any control is human enough. In this case, though, the loose and painterly style even of the Allduns looks like kindergarten scribbles compared to the hyper-realists of the 1970s and 80s, or even to the oil masters of every century up until this. For them to declare degree of finish to be degree of value simply devalues themselves, when taken in the wider context of what painting can be.
And, in a second irony, I think of Rembrandt's etchings. Central characters appear in passionate detail. Just a few inches away, minor character fade out to circle faces, dot eyes, and lines for mouths - if that. Rembrandt used degree of finish as a way to direct the viewer's attention - "Here, this matters, there's a lot to look at." The more loosely drawn characters don't detract from the composition, they define it. They are equal members in Rembrandt's compositions, and I do not feel qualified to dispute Rembrandt's judgement in creating effective imagery. I do feel qualified to defend every level of detail in his renderings - loss of any would be a loss for all.
So, I love the imagery (except for some of the motion, but I quibble). I like the in-your-face message about equality, even if Dr. Seuss's Sneetches said it more directly. And I like the rich visual style. I find a few points not so much to my liking, but that's just life. My highes recommendation, for anyone who wants a bit more from their animations.