The new DanMachi thing. Blatan cashgrab, otaku-pandering, unoriginal nonsense. I watched 6 episodes to see how bad it could get but I just couldn't take it anymore. Dropped it after that.
Out of everything I've seen, Cyclops Shoujo Saipuu. 2 minute episodes of comedy that wasn't funny, and fanservice that (aside from being atrocious to begin with) can't have appealed to many people due to the budget web animation. No real redeeming features.
But if we limit it to TV anime, which I'd expect more from due to their longer running time, it probably has to be Piano. I like slice of life series, but this one is literally bland characters being polite to each other for 10 episodes. Just boring TBH
I haven't seen many but I hated High School of The Dead. It's just dumb. I remember in the pilot this zombie was like 2 feet away from this girl and this guy who was like a good 10 feet away managed to kill the zombie.