It's hard to review this one fairly.
It's a pure drama series, provocative, over the top, sometimes brutal. This is why you will build up a lot of resistance towards it. However even though the character interactions often feel forced and over the top (everybody sleeps with everybody else and everybody is hurt), as is typical for drama shows, the series can't be called bad.
Actually the drama in this show is often times reflected very intelligently. The topic of the teenager desperatly trying to find a place in a world that turned out to be far more cruel than ever expected is realized well in this anime.
It's hard to rate this show.
It is intelligent and self aware.
However it overtunes everything like any cheap drama show and this almost makes me hate it.
All in all: If some brutal, provocative drama is what you are looking for, watch this one, at least it is smart with the way it uses drama.
If this is not your genre, this anime wont do anything good for you.