Lord Haseo said:
Kylo Ren masquerades as a badass and even though he has shown great potential the truth is is that he hasn’t completed his training and compared to any Lord of The Sith he is Bantha Poodoo. So him not being as powerful as our first impressions is part of the reason as to why he’s complex

If Kylo were masquerading as a badass (masquerading being the key word) then he would just be a wuss playing cosplay in his outfit. The fact that he did the powerful things he did in the first 90% of the movie means that he wasn’t masquerading. He was actually that powerful by definition.

“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.