Since my first post in this thread, I've been trying to put to word exactly why this style is so awful and after 3 failed starts, I think I can adequately explain it now.
It has to do with the combination of massively warped proportions, flat shading, lack of detail, and how these elements interact with each other. It makes it very difficult to convey motion in any way, prevents distinguishing subsets of design within the style, and tend to cause background objects/environments to clash with the characters that inhabit it.
Using this as an example, due to the characters already warped proportions you can't further warp them to help convey how they are moving as the tenants of the design combined with the lack of detail would cause further warping to just look like a part of the character design rather than an attempt at motion. The flat plane and shading further restricts this, forcing the artist to exaggerate the poses quite a bit to convey dancing which is ultimately what breaks it because it just doesn't look like dancing at that point. Leaving the unsettling feeling of knowing what is meant to be conveyed, even if it doesn't seems to represent it properly.
Do also note.... the heavily contrasting note, which has no warping on its proportions and rounded shading, where as the humans only have flat shading to convey parts of themselves being in front or behind
In contrast, this pic I stole from the neo-liberal corporate surrealism thread shows a mighty step forward, using warping and perspective to help emphasize the step, with the buildings and clouds seemingly in sync with it.
Further expanding on the contrasting backgrounds, take a look at this
Note that the backgrounds and objects that inhabit them are never warped like the humans are, once you notice this it makes the humans feel like they don't actually belong in the picture.
I found this while looking for images, it seems such an unintentional perfect description for the people who see humanism in this sort of art.