Is it hard to make a Decent Star Wars movie?

Reccently, Kathleen Kennedy mention that it was really hard to make a Star Wars movie because they didn't have any Comics books or anything to use as Source material... Of course the memes mentioning all of the works in the expanded universe covering comic books novels and video games come to mind. Incredibly enough in her stupid statement there is some truth about it. It is hard to make decent Star Wars movie; just ask George Lucas. Even he, has failed Star Wars.

But why have Episodes VII and VIII failed?
The answer is actually quite simple: Rey and everything she stands for  (behind the scenes).
Rey was meant to be a push for empowering female characters... and there's nothing wrong with that *IN PAPER* Now the problem lies in HOW she was "made empowered". (Insert the whole Rey is a Mary Sue speech here.) Unlike say, Jyn Erso, Rey's flawlessness made her an unappealing character.
While both Anakin and Luke had godly force powers, they both struggled and failed. From those failures they rose stronger and grew as characters. Rey doesn't. She virtually succees at EVERYRHING with little effort. The closest thing to "a loss" was not magically turning Kylo Ren to the Light side and that's because we have Episode IX left.

So, by having a badly written unappealing protagonist, you can't bring forth a good story.

We also have the issue that they didn't have a concrete plan. By that I mean that JJ Abrams and Rian Johnson basically made it up as they went along. When Johnson did TLJ, he oretty much discarded Abrams' work. Now Abrams will discard what Johnson did to do his ROSW. So there's a clash of visions among the trilogy. I'm aware that Lucas didn't have a fully set plan, but he KINDA HAD A PLAN, which is something that the new Disney team has lacked.

Then we have the disrespect towards the Classic characters. Han, Luke, Chewbacca, and Leia were all downplayed in order to make Rey shine.
I understand that the original actors are much older now and that Carrie Fisher passed away, but they didn't have to be nerfed to make Rey look good.

Now to touch the story part: Kathleen Kennedy claimed that there was no source material, yet this trilogy seems to have some similarities to the Expanded Universe.

Making a good Star Wars trilogy is not impossible, you just need to have some respect and reverence to what came before and have a passion for it. Perhaps once the saga of the Skywalkers is over, they could pull it off.