"Why does it exist" is really the only way I can think to describe this anime. For a simplistic slice of life anime about a group of friends trying to start their own band, it's perfectly fine. Not anything special, and incredibly inoffensive. But fine. You can sit down, watch it, and you don't feel like it's a chore to do so. But at the same time, it's not going to blow you away. It's obvious that this anime's primary purpose is to be one element in a multimedia project, spawning an idol group, the game, ect, and that's really all it is. It does everything you expect, and it does it in a decent enough way, but it's all stuff you'd be expecting. It has heart behind it, but that heart is cliched in itself.
I may seem like a broken record here, but that's really because I can't think of much else to say. If you enjoy the BanG Dream! game, or the songs by the real life groups that spawned from the project, then you'll likely like the anime. It's the characters you like from one of the bands, doing band like stuff, and becoming friends. If you're planning to just watch the anime, do yourself a favor, and don't make it a "drop everything and look forward to watching this" thing. The best way to watch it would be casually, in between the things that have your complete focus. In that sense the anime is enjoyable, but don't expect anything more out of it.
