Both seasons are disappointing for different reasons.
Season 01: (4/10 Stars)
Gore porn.
I've seen reviews talking about how the brutality was key to the story and I'd buy that if they were consistent with it, the story was stronger and the brutality was logical..
Ripping someone spine out and then using it as a sword is just plain dumb.
The one thing it did have going for it was killing off or crippling characters right as you "slightly" invested in them or they got interesting.
Season 02: (0/10 Stars)
They took everything remotely good and flushed it down the drain.
They strangely trying adding some Ecchi to the whole thing, cutesy word bubbles, blushing females flirting with the male characters, bad jokes and a complete lack of deaths (Other than random redshirts that have no names until after they die)
Oh, and all the characters got insanely stupid, making criminally bad choices for what are supposed to be the elite of the elite..