I'd say the first season was good-average for mostly mindless entertainment, but the charm wore off for me in the second season.
I Just noticed there is a bit of an interesting contrast with anime shows, which normally have everything turn out waaay too good (even in Attack On Titan the main cast survives just about everything) and then some of the fiction I read online where things often get much more dark, and in several it completely catches you off guard when they kill off some main cast. For the different reasons I crave both!