Given the premise of the show, it was very important to have music that was believably pop enough to sell that this group took off. What I was pleasantly surprised by was how much they dabbled in different genres. On the subject of sound, there were small details in the sound design that stood out; when zombies turned their necks, for example, there would be small "cricks" that would be audible, and it showed an attentiveness to detail.
No life-changing revelations will likely come out of watching this, though that's not to say this isn't a worthwhile watch. The show is fairly engaging and it does not cater too much to fanservice or anime nonsense.
The only true mark against it are the characters Ai and Junko, whom I really can't differentiate between and forget constantly, mentally cordoning them off as just "those other two" while all the others have a gimmick or distinct personality that sets them apart.
