I don't really want to plump for a "best show" (an assignation which is always purely subjective), but of all the series which aired my favourites were by far Jormungand, Kore Wa Zombie Desu Ka II and Saki Achiga Hen. Apologies to the T-man, I still haven't got around to trying Apollon, but it is a high priority on my backlog.
Jormungand was a show that managed to get a great many things right: it was a great action series with a very nicely paced plot and decent story. For those unfamiliar with the series, it follows the adventures of an arms dealer and her elite group of bodyguards; incredulous occurrences follow.
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As an aside, this deserves special mention for being one of the stupidest things I've ever read:
"I was massively dissapointed with Jormungand it had no real substance and oh the Jonah most of the other characters were just really carried along or 1 dimensional"
DERR HURR. Extra points for appalling use of English. For any passing readers, I feel I should point out that characters had plenty of depth. I could go into why, but instead I would urge anyone who hasn't seen the show to check it out. Preferably now.
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* I'm absolutely serious, I can't think of a better harem. All the girls are god tier.
Saki Achiga Hen is a sidestory to "Saki", and follows various groups of girls who battle to win a mahjong tournament whilst SOL elements intermingle. I suppose it's best described as being a moe-battle series - with some similarities to K-on, albeit with a far broader cast.
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If you're looking for a great SOL show with a twist, then I really recommend this. There is implied yuri throughout the show, so just mind who you watch it with.
Honourable mentions also go to Tasogare Otome x Amnesia (Dusk Maiden of Amnesia) and Acchi Kocchi. Both of these are very good shows, but I wouldn't say they were essential viewing; Upotte!! was another show I enjoyed a great deal, but I concede is one which has little appeal to non-guntaku.
Anyway, that's all for now. Of next season shows I'm looking forward to Muv Luv Total Eclipse, Binbougami and Campione, but as always time will tell what's actually good (and there are usually some unexpected surprises).