Unlike first season, it failed in the balance between silly magical logic / naive plot and amount of awesome needed to properly excuse it with rule of awesome. Amount of awesome is slightly less than first season, while amount of the former is considerably higher. The disparity is almost enough for the whole thing to fall apart.
So what this results in, is that one moment I'm like ''oh fml this is so retarded/naive I can't possibly recommend this to anyone'' and then next moment I'm like ''fuck me this is so fucking awesome everyone should see this''. First season had more of the latter, second season has more of the former. It could have also worked if it tried to be less dramatic, then it would genre shift into a silly moe comedy with awesome concert battles, and it would be excused one half with rule of funny and other half with rule of awesome.
Some scenes and episodes in second season are really good and really enjoyable to watch. If you're in it just for the moe, you'll have an easier time enjoying it. If you're in it for the story and original setting, you will probably have a hard time not quitting. If you're in it for the awesome and liked the first season, definitely give second season a shot.
Music wise, It's slightly disappointing that most songs are the same ones from first season, but if we count OP/ED, I think there are 4 new ones. OP is not as good as s1, but isn't bad I suppose. ED is quite close to being as good as s1. Other two songs seem okay, but all the really awesome ones are the same ones from s1.
What this show needs is less talk of succession, radiance, elections, competitive spirit, center nova, and the magic of their succession system... and more of political, psychological and social aspect of entertainment ban, and actual fight against it. Then it would have even been a masterpiece.