User blog comment:Gundam Legilis/RWBY Schedule/@comment-11188061-20150521020309/@comment-25555436-20150521031644

Chishio, MMD is designed to make characters (Vocaloids for starters) dance. Of course, it can be used to animate characters doing other stuff, but as that's not what it was designed for, the result tends to be mediocre if compared with other animation programs.

That, and the Vocaloid fans have somewhat low standards for quality, so what we see as "a bit good" they would see as "great! it's finished!".