Kylo had training from Luke, and then had continued training under the Knights of Ren + Snoke. Yes, his training isn’t complete. And yes, no one should expect Kylo Ren to be a Jedi Master. But if we are talking purely:

Rey IS a Mary Sue by definition. She is. Now, if you want to argue that Mary Sue character’s aren’t always a bad thing, then sure. But I think it’s ridiculous to say she isn’t, or that the only reason people are bringing it up is to “tear down female characters”. This is kind of the problem we have right now with…