It was alright. To be honest, I wasn't a huge fan of the last arc. The whole bit about the little girl assassin (who I found, frankly, a pretty boring character) and Iwai being connected was just pointless, and the whole idea of the Order Made Authors doesn't feel like it has any purpose other than to give the mandatory evil organization something to do. The whole thing with Kiri and Grayland was pretty good, though. And I still like Kiri and Iwai as characters.
Thing is though, it ended I expected. By that, I mean it didn't end. The series just stopped, building to another season that will almost definitely never happen (a trend that I absolutely hate, by the way).