The fact that he doesn't look or feel as imposing as Vader IS THE WHOLE POINT of his character in TFA. I hope everyone is getting that. This trilogy is a whole new flavor from OT, just as the PT was. If anyone is looking for the ST to check of their OT boxes on character and feel before you like the ST entries, I'm afraid your going to be sorely disappointed.
It's interesting that the criticism of TFA seems to have rolled into two camps. Those who thought is was way too much like ANH, and those who thought it was way too little like ANH
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The thing about a Star Wars movie is that you've got heroes you love all around that you are really pulling for, but it's the main villain who sets the tone. It's no different in TFA. While Vader's conflict was buried and dormant, Kylo's is RIGHT on the surface. Everyone who knows the Force knows this instantly when they encounter him, and IT DRIVES HIM CRAZY!!
it took Lor San Tekka about 4 seconds to start using it against him!
I would not look for Kylo's conflict to resolve itself so that he can walk around, Eps VIII and IX doing a Vader impression. I expect it to intensify the more he tries to squash it until it finally erupts (one way or the other) when he finally faces Rey one more time.