I never actually did any research to verify these impressions, but I gathered BanG Dream! was another salvo fired in the idol war in support of the sort of full-spectrum operations adopted by the Wake Up, Girls! project. That is, it's an anime about a girl band which corresponds with a real life girl band presumably comprised of the seiyuu who will do crossover events and whatnot. The anime part at least started out sort of amusing, with high genki determination and amusing moments peppered with actual gags. I particularly liked Arisa's American approach to trespassers. Kasumi best not try that shit in Texas.
Unfortunately, the more recent episodes took a more serious turn involving a mother on the verge of dying from Key AIDS and people feeling guilty about not being good enough martyrs. I can understand why the show might want to introduce some drama in an effort to get viewers more invested in the outcome, but it's not at all successful for me, at least. The tonal shift is not jarring exactly, but I think it's still unnecessary. And then the show added another twist which I guess will be the final obstacle they'll all have to overcome. Even a show as good as Hibike! Euphonium did not pull off all of its bits of band drama flawlessly; BanG Dream! is having a much rougher time of it. This is not something I want to continue watching, anyway. It's not bad, exactly. I've just lost all interest.