Personally, I felt this series drag on needlessly at times. It was melodramatic and I felt as if I was supposed to feel certain scenes were important. A rule of thumb for me is that if I realize that I'm supposed to be feeling something instead of actually and naturally feeling it, then it could be better.
That being said, I understand it was trying to get at deeper things and I respect it as not being a cookie-cutter series that copies other anime formats. I don't think it was executed as well as it could've been.
To be better it would've moved faster, done away with unnecessary exaggerations, and had a better soundtrack.
For me, it's the type of anime you play in the background while doing something else.