At first I was kind of shocked when he went apeshit on that console with his lightsaber, and I ended up enjoying that scene. I thought it was an interesting departure from Darth Vader, having Kylo Ren be a young guy with still much to learn. The best villains are their own worst enemy, and something in their personality gets them off track from victory.
Remember near the end, Snoke said he was recalling him to finish his training -- so it's not like he's some kind of stoic jedi master. The way he was portrayed for this particular chapter in the story made total sense to me. He'll come back more powerful and maybe a little more in control of his emotions.
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