Stopping the blaster looked to be a variant of what Vader did in Empire, which was deflect blaster bolts with his control over the Force. I'm hard pressed to say what he did showed impressive control of the Force, since it feels like they did things with the Force because they sounded like cool ideas and hadn't been seen before. They were trying to find something different. But it's not to say Vader or Luke or the Jedi of the prequels couldn't do the same things that Kylo Ren showed off. It's a common thing when you have something really familiar you need to find something different to do with it because the cool factor is now lost. So you have to get more inventive as a creator of a media to keep the audience interested still saying that was still cool. So I can't say that he was that good until he does some things that you've seen others do so you have something to compare against. You need common ground to know how talented he might be.

He's a conflicted character and immature. He's a kid, still doesn't change me from being unable to take him seriously. The second time he threw a tantrum they made it into a joke rather than actual serious moment. The movie doesn't even treat him seriously at times. So it's hard for me to do so.