Ano Hana
Not the worst but boooooring as hell and the main female was useless and annoying as fuck, I totally stayed unmoved the whole time. But friends insisted me to watch it because it was some beautiful emotional anime and at the end they were like "Wow, you're a damn cold hearted person." Asked them why they thought the contrary XD
Also one friend tried to trap me into watching Boku no pico, telling me it was a very popular anime with an awesome plot and to watch the first episode without knowing anything beforehand. Good thing I looked about what people were thinking about it on the internet first. Curiously I don't talk a lot anymore with that friend now.
Also the shonen type Naruto, Bleach and others are really not my thing. Beginning is often cool but it always ends up in things like "oh no the villain is too powerfull and killed my grandma, I'm so butt-hurt I'm gonna ignore all my injuries and got suddenly overpowerful from my butt-hurtance to beat them." And then another villain even more vilain appears, and the same things again and again.