Fair point, about Luke being a bit naive. I wouldn't go so far as to call him "coddled" (compare his life growing up to Princess Leia's.) But Luke was inexperienced with the wrong side of the tracks. Rey is not.
I think ultimately a lot depends on who Rey's parents are. Making her a Skywalker would do a lot to excuse the TFA gripes. Making her a Kenobi would be better than nothing but it doesn't excuse the problem as well as a Skywalker. Although IMO that might make a better story overall.
I also agree with the comment that Rey needs some kind of character flaw or development problem to overcome. That was a problem with TFA that went beyond the Force issues. She was just too perfect right out of the gate.
But Geez, if they make her Luke's daughter, that's not a very good reflection on Luke. What, he starts a Jedi Academy, he loses his star pupil (who happens to be his nephew and the son of his best friend) to the Dark Side, dumps his daughter off on a dangerous planet to fend for herself, and goes into hiding on a giant rock in the middle of the ocean of some remote planet?? God, I hope she's not his daughter.
And besides that, what kind of a Jedi would he be if he broke the Jedi code by having a child?! They had better not make MaRey Obi Wan's granddaughter, because he is the purest character in the whole dang storyline, and I'd hate to think he broke the code and sired a child.
The Wook