That's a very strong assumption to make, I could easily assume that most casual movie viewers watch the same derivative knock-off action/horror/comedy films over and over and over again without issue. You think Adam Sandler is the highest earning actor/producer because his audience perceives a great deal of depth novelty in his work?

The answer that requires the fewest assumptions and is consistent with almost all basic statistical analysis is that a group of people predisposed to like a movie will rate that movie higher than a group of people who watch movies regardless of their predisposition towards it.