For me it was Owari no Seraph, and I dropped that shit like a rotten potato because the MC was an edgemaster McEdgerson and in the 2nd episode he was punished by being sent to a highschool until he found a friend. Now I'm willing to put up with quite a lot, but the fact that this little gem was included in a show which had the MC in a military unit fighting monster was waaaaaaay too much for me. If a show includes a military aspect, it either needs to be spot on or absolutely looney (and self-aware about it) or I can't stand it. Even some SOLs like Sora no Woto and Strike Witches kept very close to their military roots, so the fact that Seraph went retarded and still asked to be taken seriously was beyond my capabilities.
And now I'm angry over a dumb show again. Time for the vodka!