Maybe it's possible to compile a taxonomy of why differences of opinion exist...

1. People are different (part 1). One's genome may process adrenalin differently so that one person's horror film becomes another's snooze-fest.
2. People are different (part 2). Did the movie 'speak to you' because of all your accumulated influences that define your personality, or leave you cold as you haven't 'travelled' there yet, in real life or in imagination?
3. Encountering a pop phenomenon after it was a thing? It may have went viral/topped the charts in its day, but coming to it a decade afterwards won't have the same effect. You maximize your chances of liking something if its defining/reflecting the zeitgeist. Tone dates. Effects date. Editing styles date. Everything dates.
4. State of mind when seeing it. Are you watching the movie out with your mates after a couple of drinks, or alone after a traumatic break-up?
5. Did you see the movie on IMAX in the sweet-spot, or your iPhone 3GS whilst commuting? Was it 'edited for content' on a red-eye flight with numerous interruptions?
6. Have you overdosed on the movie/song/album/band/TV show? After binging on Jim Beam or chocolate cake, it may turn you off them for life. Why wouldn't it be the same for a movie? You can have too much of a good thing.
7. Peer group pressure. If everyone says 'x' is cool, are you forced to conform? Or are you forced to take the opposite viewpoint just to be different? Does your inner hipster refuse to like mainstream fodder?
8. Wrong age. Stuff is targeted to certain demographics. Why would 30-year olds like stuff made for teens? You can outgrow something you used to like.
9. Geekdom. You've read every article, watched every interview, behind-the-scenes, out-takes, etc. Of course you'll "get it" compared to a novice coming in cold.
10. Culture - why would we like the latest hottest Japanese fad, when we grew up in the west?

There's probably many more...

It's hard to believe Disney (c'mon Disney of all studios) is going to restore credibility and de-infantilize the franchise. We'll see.