I liked the first season of this show. I intensely disliked the second.
Story: I felt this season lacked a strong central theme/story thread. Last season, the central theme was "finding acceptance for Kirino's weird hobby." And it worked well. This season's theme seemed to be fanservice. The stories were lame, disjointed/unrelated to each other, cobbled together, and lacked coherency.
Characters: Annoying/10. Didn't really develop any further, except Saori, but she turned out to be boring. Too many tsundere chars, and way too much arguing over Kousaka. Lamesauce all around.
Overall: Too fluffy, lacked substance.