1) The fight scene with Kylo Ren and Rey is bad storytelling. Rey's victory is incomprehensible, even allowing for Ren's injury and mental turmoil. She flat out should not have won in the fashion which she did, but Disney has this weird inability to give the villains an actual leg up on the heroes. This is a real problem with Disney's storytelling in general, and was particularly pronounced in the Avengers movies.
Go ahead, rewatch the Avengers. I loved both movies, but the Chitauri (and Ultron), were ultimately about as threatening as Cobra vs GI Joe, expect Cobra Commander got the upper hand from time to time. There is never a point where the Avengers appear even remotely endangered by either threat.
As a result of this, Disney sucked all of the threat out of Ren as a villain, and any potential tension out of their inevitable rematch. Luke beating Vader in Return made sense. Luke earned that narratively. Rey just didn't. I don't care if Ren trains in the future, because he has already been established as a lightweight.
2) TFA does not earn any of its gravitas. It leans way to heavily on the shared cultural knowledge of the original trilogy, which lets Abrams get away with telling the story in shorthand. As a springboard to a new trilogy, in the context of 6 previous films, it is a fine effort. But as a film, the character arcs are weak, the overall plot is simultaneously long and rushed, and it assumes so much investment from its audience that it is painful. This is Abrams biggest weakness as a director; he doesn't understand how to generate memorable moments, only how to draw us into his own nostalgia. This was painfully apparent watching TFA.
Overall, the film played it safe, and I am hopeful this will lead to a new direction in the films down the line. Bluntly, I don't think Abrams has the artistic vision to do something new.