Shockingly good. Yes, really, I didn't expect it to this degree when I started watching it. Story, characters, feelings, this has all the elements that make a great show, the kind that you don't get to see every season...
As a bonus, if you liked Inception, then this is definitely for you.
Ah, but it may not be for you if you don't like to think and have your mind challenged :P
However, I already gave it a 10 like 2 episodes ago and it's still getting better? There are no better scores left to give it..... I guess 11/10 it is ^_^