I've recently started reading Masou Gakuen HxH. The plot and characters went from alright (typical shounen harem) to retarded and annoying (I'm at Vol. 8).
>It's an endless repetition of the main characters getting horribly destroyed by almighty opponents, just to asspull a countermeasure that slightly improves their strength. But then they defeat the same opponents as if they're nothing.
>MC wants to save everyone, even if they try to kill him and his harem.
>Enemies become friends through the power of japanese high-school life.
>Embarrassing idol-arc, where the heroines want to at least make their enemies happy.
>Forced yuri, because the girls lose all strength when they're touched. Yes, I dislike yuri.
etc.
At least lewdness, buttslut and incest keep me going.