Inspired by Bryan's comment above, another pet peeve of mine is "Roguelike" and "Roguelite" to describe procedurally-generated games. Fewer people have heard of Rogue (much less played it) than either Metroid and Castlevania, but the terms now encompass a very large number of games. Rogue was...
Games that punish failure by forcing you to backtrack and repeat easy tasks over and over. Hollow Knight, most Souls games, Control. Checkpointing is a difficult art, but I have too many games in my queue to waste my time repeating easy tasks.
"Smooth" filters in 80s/90s retro games, especially...