developers who don't listen to their fans, and if you point out to them that they made a (clear) mistake, they reply that it's not true and that it has to be there
dream sex (usually used to insert sex early into a story before plot/relationships are developed)
sleep molestation (same thing)
lazy incest patching (change relationship title from "roommate" to "sister", the relationship is never commented on, never referenced beyond the title--with no actual context for any tension or preexisting relationship)
linear sex progression (1 sex act per interaction, starting with petting and then elevating to anal over the course of 5-6 "progression" scenes that are spread out, like, A -> AB -> ABC -> ABCD -> ABCDE ... or A -> B -> C -> D -> E ...)
extreme (IMO, anything even closely beyond "reasonably realistic") bimbo proportions of tits and asses
MC written with the personality of an immature, horny school boy
"sandbag MC", what I call an MC with zero / very little agency or participation in moving the plot or relationships forward--a character that is more of a prop or object being acted upon by other characters / events