http://www.forbes.com/sites/erikkain/2018/01/02/heres-why-youre-wrong-if-you-think-rey-needs-more-training-in-star-wars-the-last-jedi/#41f77132669dI only skimmed this, but some TLJ are really reaching to justify some of the issues with the sequel films. While I did consider Rey a Mary Sue, I'll recant that. She's not a Mary Sue but she's pretty close. From what I read here, it's like the writer has to crap on Luke in a sense to justify his arguments in defense of Rey. He says Luke was 'relatively pampered' compared to Rey. Granted Luke was raised in a stable household, but he also grew up on a planet controlled by Jabba the Hut and where the Sandpeople roamed, it wasn't a paradise. And it's like Luke getting assistance from Obi-Wan's ghost in the Death Star run, him losing his hand in Empire, and then him getting fried by the Emperor are ignored. Rey hasn't encountered anything like that so far.
Granted she did go to Luke and ask for his help, and she did hear voices when she touched Anakin's lightsaber, but that's not the same as a Force Ghost actively instructing you like what happened to Luke. And while Kylo Ren wasn't trying to kill Rey in TFA, neither was Vader trying to kill Luke in Empire, yet Luke lost a hand, and in TFA it was Ren who got a lasting scar from the encounter. And it's not just Luke saving the day in TLJ, he does provide the distraction, but it's Rey who saves the remnants of the Resistance with her rock lifting.
Rey is vastly overpowered for these films, in comparison to Luke, or even Anakin (who was supposed to be the most powerful Jedi ever), and people don't want to admit it. Rey is not a bad character, just a poorly developed one, and juicing up her abilities without proper explanation or training (when previous saga heroes got one or both of those things) doesn't fly and actually weakens her character.
http://www.forbes.com/sites/erikkain/2018/01/02/10-things-star-wars-episode-ix-absolutely-must-do-to-be-amazing/#22622b41dc90I'm more in line with his points here than in the other article. I was thinking about #2 myself. Rey needs a double lightsaber. I also would like Ren to get a more traditional lightsaber. It might have been nice if he had kept Anakin's blade.