They were all one season weren't they?
But yeah the second arc wasn't that good.
I actually couldn't really tell if it was bad bad or it was just because I was disappointed because as far as I remember in the LN, Fairy Dance was actually a pretty good volume but I couldn't really feel the same atmosphere out of the adaptation.
I've started watching Shingeki no Kyojin because Water recommended it.
It's really good, but I should mention that it's kind of gory (more gory than Elfin Lied).
I've only just started this show actually, and I thought it was going to be not that great since the premise didn't really hook on for me, that is until I saw how much of a badass everyone was with their 3DMGs. Seriously, I can't get over how ingenious those things are.