I guess it's like me and movies. I like sci-fi, but that's not enough for me to like a movie. I don't typically watch dramas, but if it's got enough other interesting things going for it, I can enjoy a drama film.
I really like certain directors, but not everything they make.
I know there are some that can enjoy something based on a single aspect alone, but I imagine most are like me. Then again, it's possible I'm the weird one.