For myself I would say I don’t hate any of them and I would, some day, rewatch every single one of them, but I can’t pretend that I like TPM, AOTC, R1, Solo, TFA… (I like some of them when propertly fan edited though) I can enjoy them, find qualities, rewatch a few sequences and be glad to see the “SW soul” supplement in them compared to the average blockbuster, but I honestly don’t like all of them. As a whole, it’s different, and maybe the “I-IX” experience may give the Saga something more as a complete movement than what just separate entries do.
ATOC and TFA are the only ones I did not fully enjoy on my first viewing. Both have segments that just took me right out of the film and derailed the story for me and I have never been able to recover from that. Both need a good fan edit (I would do it very lightly with as few changes as possible) to bring them up to the nearest stories. I cannot say I hate any of them, but those two I have the most profound issues with. Though in contemplating it, one of my issues with TFA has led to a personal retcon that solves a lot of issues for the entire Star Wars universe. Still, it would be a better movie if that was not needed. And the sections of ATOC are just bad and need to be axed.
Indeed AotC’s bad bits, while pretty bad, are relatively harmless. It doesn’t uproot the story or universe. It’s just bad scenes and/or dialogue that can easily be cut. It’s not the same as the problems some people have with TLJ or that I have with RotJ that come from taking the saga in an infuriatingly terrible direction. Granted, some of the problems are also the sort of harmless, easily removed, stuff with no implications down the line, like AotC, which just makes them even worse.
Out of curiosity, what is the headcanon you mentioned concerning TFA?
Both TFA and TESB have some issues with the use of the word system. Take it as it is typically meant, that of a star system, and both those movies are derailed by science. But if you take that to be a planetary system (a planet and its moons) you can have the Millennium Falcon fly from Hoth to Bespin in a reasonable amount of time and you can have the people on Takodana watch the destruction of the Hosnian system without it being completely impossible. But even in the same system, watching the destruction of the Hosnian system stretches believably too far for me.