Alot of people didn't like the 2nd season anime, because they said the music scenes aren't long enough. I liked the 2nd season much more, because of the music scenes was shorter. If I wanted to hear the music itself, I'll download/buy it. Especially when classical music sound so much better with my headphones then my cheapo PC speakers.
For most manga adaption, it's pretty boring to watch the exact same thing again. But the mood of the first season was done better, the 2nd season was a much faster watch. I think it's the problem of the length of the season, 11 episodes means the season needs to be face pace. 26 (was it 4?) episodes can take things abit more slower.
There's quite alot of story left, is there any news how long this season would be? There's about 7-8 volumes left, usually this would take a full 2 cour.