Star Driver ep 11 - Hmm. This was far more fleshed-out than most of the other "monster of the week" episodes, but was still left wanting to some extent. Also, Sugata totally randomly using his power was pretty cool from the POV of the fight that was going on, but was a little weird given how much trouble he might have been in afterwards. If this really is only 12/13 episodes, then I don't see how they're going to end it, so hopefully it has more time to recover.
Yakumo ep 11 - Ehhh, I've watched this through and even read some fairly thorough blog posts on it, and I'm still not sure what's really going on. It feels like they threw two or three separate arcs together in one short series and didn't quite blend them right.
Yosuga no Sora ep 11 - At this stage I guess it's become quite obvious, but this show really does just seem like an excuse to animate some of the sex scenes from the game. Bit disappointing.
Ika-musume ep 11 - This show found its groove a while ago, and while this ep did nothing overly special (although the bit with the dolls was predictably excellent), the basic premise and the cuteness of Ika just works.
Nurarihyon ep 24 - Flat-out evil bad guys are good to have once in a while, and I think the conclusion of this arc has been played out well enough to make up for some flat episodes in the middle of the series.