I can think of quite a few, mostly because they're so over-the-top clichéd, rather than just completely incompetent:
<Sacred Blacksmith
>nippon steel folded 1000-times waifus
<Another
>ringu-type slasher j-horror totally over the top
<Ichiban Ushiro no Dai Maō
>a.k.a. color wars, easter-egg assortment of cardboard cutout waifus with blatant wish-fulfillment protag
<Zero no Tsukima
>tsundere waifu and pussywhipped horndog protag, cranked up to the point she literally keeps him as a pet and whips him for taking passes at girls
Also, not an anime, but if it were it would win in a walk:
<Dungeon Seeker
>the edgiest most fanfic-tier isekai manga ever to edge an edge, almost reads like a parody, but it's absolutely 100% serious