Let me change sub topic a bit.

What about tropes/themes/content that you really dislike (not because of shock or disgust) in anime that prevents you from recommending it to other anime watchers?

Mine would be excessive, blatant fanservice. Shows like Maken Ki, Qwaser or Queen's Blade are unpalatable to me, so I don't recommend them, or even dissuade people from watching them.

I am also starting to get sick of all the childhood friends running around all over the place.