I think debates regarding what constitutes a “real fan” are silly. People have different tastes and varying amounts of free time and disposable income. But at the same time, if someone only likes one or two of the movies and dislikes the other nine or ten, at what point are they not a fan of the franchise and just someone who enjoys an individual movie or two?
Not saying you have to love all of it, but if you only enjoy 10% of something, are you really a fan of it?