Guilty pleasure makes no sense to me

There is the difference.

Many people do like movies the actually think are bad. In fact the term "so bad it's good" is used to describe movie that people enjoy because of how bad they are.

Guily pleasure is much different though. I think the best way to descibe it is a movie that is dumb fun. I consider movies that are dumb fun to be good movies but they arent good in the same way as an intelligent well written movie is.

Furious 7 for example is entertaining because of how idiotic it is imo, and that is a movie that is pretty well liked. Something that actually surprises me.