I honestly thought BanG Dream S1 looked fine too. My theory is that a lot of people couldn't get past parts of the art style, like all the girls having star-shaped pupils.
S2 I feel would be a bit rough at first for people who haven't played the mobile game. They do an admirable job introducing the bands for new viewers, but it's still four whole new bands. Granted, as others have said before, the main story only focuses on a few of them.
**R.O.B.A.Z.O.I.D** (On mobile)