Alderaan said:
“Complete his training” is relative. If he’s already enough of a badass to freeze someone in mid-air with his mind at will, or stop blaster bolts in mid-air at will, or telekinetically fling people through the air at will, then you would assume “complete his training” would give him some powers even greater than those, not just help him remember he has those powers instead of forgetting about them when the plot conveniently calls for it.

Correct me if I’m wrong, but there is a bit more to the mastery of Force than cool magic tricks. For example learning to refrain from shoving your supernatural ability into everyone’s face.

I personally love stuff like the freezing of the laser bolt. It makes perfect sense in the context of how I see Kylo Ren. He didn’t need to freeze the bolt, there were dozens of other ways he could have deflected it. But this one was the coolest one. He desperately wants to be like Darth Vader. He might have inherited some of his talents, but right now he still knows he is nowhere as feared and respected as Vader was. Vader would probably not have stopped a laser bolt mid-air. He could if he wanted to, but to him that would be just senseless showing off. On the other hand Kylo is a far different character. Most of all he wants to make an impression. And if the surviving witnesses of his stunt are anything like us, they are discussing what they saw to this day.

Anyway, that’s my interpretation, which is probably a tad more favourable than others. 😃