Maxperson
Morkus from Orkus
That's just asinine.
First, they didn't become "people with failures blah blah blah," they become failures. Their new characterizations are defined by their failures, and their past successes have been rendered inconsequential, and dismissed. Leia is a leader, and failed. Luke is a Jedi, and failed. Han is the pilot of the Millennium Falcon, who was elevated by his love for Leia. He failed. They all failed utterly at the very thing for which they became iconic. There's a huge difference between humanizing a character and destroying it.
Secondly, no one looks to Star Wars for nuanced depictions of people with complex personalities. Star Wars is an epic fight of good versus evil, just like The Lord of the Rings. I don't open a Tolkien book to explore the misery of pipeweed addiction, and I don't go to a Star Wars movie to watch a fallen hero wallow in self pity. The Star Wars story is unabashedly and unapologetically an interpretation of "the hero's journey" as an epic space fantasy. You can change that to be a dramatic exploration of human foibles, but that takes the story out of the realm of science fiction/fantasy and recommends it for a much lower budget. Besides, no one seems to feel like Rey needs to "become [a person] with failures, setbacks, and foibles," that kind of crap is reserved for the heroes introduced by George Lucas.
I've been neck-deep in adulthood long enough to appreciate my escapist treats.
As much as I agree with you about the destruction of the old generation of heroes, Rey does suffer failures and setbacks. She suffers a setback when she fails to convince Luke to train her and has to steal the books in order to learn, and she suffers another setback when she fails to bring Kylo back to the light side.
If she was this Mary Sue people keep talking about, she would have succeeded in having Luke train her, and then brought Kylo to the light side, which actually would have been cool. The two of them could have faced off against Snoke in the third movie.