I dunno if I really care that much to stick around in the spoiler thread talking about plot points in the movie because most of it is so obvious in intent that there really isn't much analysis required, but I will say that I loved the characterization of Kylo Ren. It's the one clever thing in the entire movie which is otherwise just ANH for the current generation with more diversity and gender equality. Taking a Darth Vader stand in character and making him a try-hard young punk who WANTS to be a Darth Vader stand in instead worked great. The casting was amazing too. He reminded me so much of a young Snape from Harry Potter. He would have been a great Anakin in the PT.
I don't think him losing at the end was particularly weird either, because they did a good job of showing that he wasn't really a great Sith warrior like Vader was throughout the film. Every time anything went wrong, he would lose his cool and just rage out and everyone around him would be rolling their eyes. He has no real respect from the First Order, and they just tolerate him because of his force affinity and because he's Snorke's disciple. So it comes as no surprise that when push comes to shove and he has to actually fight another force user, he just chokes hard.