Boku wa Tomodachi ga Sukunai: This was like a discount version of My Teen Romantic SNAFU for me, or more like an annoying version. I didn't like any of the characters, and it was a different kind of ecchi(loli), something I couldn't stand, and it was just incredibly boring.
Danganronpa 3: Boring and confusing.
Eromanga-sensei: Utter trash.
Gakuen Babysitters: Cute and inoffensive but not for me.
Houseki no Kuni: I heard that this is actually an excellent anime but the 3-D animation was kinda weird for me. It looked absolutely gorgeous, can't deny that, but I couldn't get used to it for some reason.
Joker Game: Stupidity galore.
Koutetsujou no Kabaneri: Bad-ass steam punk action gets repetitive after you see it for 6 straight episodes and I heard that it gets worse after that.
No. 6: Bland, convoluted and boring.
I also have a few anime in my 'on-hold' list which I'm sure I won't watch again.