As for a season 3? It DEFINITELY needs one. But there are some serious problems with season 2, so it might not be green lighted. As a fan, I enjoyed the first 6 up until the "Cinderella brawl". And Ichika's birthday was a bit fun, plus the Golem II attack. But after that it was almost painful to watch. They could have done a lot more with the series giving some development or backgrounding the girls. Right now in the series, you know a little bit about Rin, Houki and Charlotte, but Cecelia's still a blank. If you haven't read the LN, you're out of luck on her history. And I'm not the only fan to admit that.
Rominmusa wrote: the last 6 episodes of s2 is feel like special episodes / ovas
There's a lot of filler in season 2. The Charlotte panty episode, episodes 11 and 12 are complete filler. The Golem attack in episodes 8/9 are a little out of place (in the light novel, there's a big IS race happening at the same time as the Golems 2 attack).