My 2 cents - don't want to start a debate here, as I know the ST has some genuine fans here. I'm not one of them.
The two mainline Disney SW movies were awful. If not for the name attached, they'd be standing proudly next to Jupiter Ascending. They're a perfect storm of being bad on their own and being bad as a continuation of a franchise.
- both are glorified remakes (TLJ less so, as it mixes ESB, RotJ and 'subverting expectations') with rehashed plots
- nostalgia pandering without adding anything of substance
- TFA wants to simultaneously be a reboot and appeal to old fans, ends up dishonoring legacy characters and undercooking the new ones
- no regard for the mythos and worldbuilding, which are these movies' foundation
- no regard for what came before, only lip service; JJ's TFA is just carelessly indifferent, while Johnson's TLJ is actively mocking of the stories/characters and fandom
- disservice to all the new characters who really don't have time or opportunity to become 'their own' (maybe save for Kylo)
- TFA is an empty promise of the worn 'mystery box' idea
- TLJ is a petulant reaction to that focused on meaningless 'gotchas' and the idea of subversion, only to end up on the same tracks by the end, while somehow completely cutting the potential of a sequel
It was like a perfect one-two punch of awful. And Disney already laid the groundwork for the franchise's decline, by angering fans prior to both movies releases.
- they canceled the Clone Wars TV series, which by that point was a) beloved and b) really good
- they canceled the original tv series from Lucas set in the 'dark times' between PT and OT
- they canceled all the in-production games, including 1313 which was generating buzz with the fans
- they handed the license to EA, which proceeded to a) sleep on it for 7 years now, not counting b) Battlefront, which is mired in the lootbox controversy
- in one fell swoop they made the old EU redundant, a) making a lot of people feel cheated and b) making the SW world a lot smaller; it doesn't help that the new EU isn't that great (the new EU's problem is that a lot of it is inconsequential, it's a glorified promotional material for the movies, while the old EU, with all its warts was mostly interested in telling new stories)
Gutting the old EU made a lot of existing merchandise worthless, while making movies with undercooked characters that don't really have much to do (Finn, Poe, Rose, to a lesser extent Rey) made these characters less desirable as toys.
It's actually surprising that SW is doing this well. Disney is now in full damage control mode and to their credit they seem to be making all the right decisions to course correct:
- bringing back the Clone Wars
- making a tv series set in the OT continuity, with actual fans at the helm
- making another tv series and game in the 'dark times' period (maybe reusing some of the stuff from the Lucas tv series)
- retconing a lot of TLJ
- not really touching the ST period
Time will tell if it's enough to return the brand to the glory days.