all i got to say is super castlevania mother****ing IV.
I'm actually currently playing through that game. I'm taking breaks during it though.
I agree with the topic but usually with that being the case I don't play those games after I have beaten them sometimes. One thing I do hate though that has to do with difficulty are those games that require you to play on the hardest difficulty to complete the whole game or get the full ending. I think Turtles in Time was one of those types of games and that's one of my favorite games from the SNES.