Can't say I have any guilty pleasures related the the series honestly. Though I do disagree with a lot of people on points about the series I can't say I'm embarrassed about any of my stances there.
A lot of people complain about the jumping and knockback mechanics on the classic games but I think that just comes out of a place of misunderstanding. The mechanics are unusual, but they're perfectly designed to work with the games they're made for. To complain that the jumping isn't like in Mario or Mega Man is to miss the point. I also defend Legacy of Darkness as a legitimately great game, especially for its time, but I'm not ashamed about that.