As for it's issues, there are too many underdeveloped characters. This is a very big, glaring problem. It feels like some characters got ignored or even screwed over. Akari, for example,pretty much got no characterisation. Character are tied to the plot to an extent, so this hurts that in turn. Particularly in the last 2 or 3 episodes. It's very disappointing if you like more than just chaika and toru. This was a big reason why I couldn't give S2 a 8. I even considered giving it a 6.
Speaking of which, if I had to summarise the last episode in a word, it'd be "abrupt." No explanations are given for much of what happens in the epilogue. Not much indication of what everyone is doing now or what happened immediately after the conclusion.
Don't get me wrong, despite this, I enjoyed this anime a lot. I had high hopes for this show which were not met. Season 2 really would have benefited from more episodes. I'd say another 4-6 would've been enough to show great improvement. If there was more characterisation and the ending was better, this easily could've gotten an 8. Anyways, as for the entire series, I'd recommend it.
