Before you watch the anime, read the novel. The anime rushes through so much stuff, if I hadn't read the novel, I'd be quite confused at what was even happening at times...
Once you've read the novel, if you want to give the anime a shot, I say go ahead: It's not a great adaptation, but nor is it that bad. I personally have lost interest in watching this season.
We know from MAL that it only has 13 episodes. I know I stated that they're rushing things, but there is far too much content for a mere 13 episodes and the more interesting stuff happened later in the story (Or at least, what I found more interesting), as such I'll be hoping a second season comes out (They should be able to get the bits I found boring finished up in S1.)
