The first 12 episodes spent waaaaaaaaaaaay too much time with Ringo as the focus character. I always felt she was a bland and uninteresting character and then she crossed the line to irredeemable when she drugged and nearly raped Tabuki. I know a lot of people will say that it's just the dark comedy in the show but I didn't find it funny or entertaining at all. Even having the tables turned on her and almost being raped by Yuri didn't improve my opinion of Ringo. The fact that Shoma has been dragged along for most of this storyline without doing anything of importance just makes me not give a shit about him.
The Tabuki and Yuri story line just seems pointless even with their connection to Momoka. Honestly it was more interesting to me before they revealed Yuri as a crazy pyscho with a sham marriage. Tabuki really hasn't done anything worthwhile in...ever I guess, which is sad because I feel he could be a very interesting character.
The Masako/Mario storyline got slightly better after this last episode, but again it is being dragged out for way too long, and her obsession with Kanba is getting old.
Really the only story lines that keep me watching are Kanba and whatever the hell he is up to and Himari and her relationship with Double H, but again it's been way to slow in developing those stories. Hopefully when they do finally get a lot of attention they will actually be interesting.