I think that the big problem here is the color dessing.
It,s look too bleak and pale for something destined to little girls. It,s needs more color. With gurihiru working in the promo comic the contrast only make its worse.
I always had a problem with marvel in house animation color style since avengers assemble. I felt it make it look too serious and stilted for saturday morning shows, something that also makes the jokes felt anti-natural since the visual style makes you in the mood for something more serious and it ends feeling like a mood whisplash.
This is going to be the last Marvel animation proyect done by their own division?. Because as far as i know Moon Girl and Deadpool are going to be done in Titmouse.