I actually laughed in the theater when he takes his mask off to reveal that he’s just some bratty kid. It’s a fantastic moment, gives you the exact impression of him that you’re supposed to have: he’s a wannabe who has very little idea what he’s doing.
I strongly agree. The only difference is that you think this is brillant while I believe it ruins the main menace… and the story as a whole. In ANH Tarkin and Vader are cold and intelligent; in TFA their “young versions” Hux and Ren are so childish that I never believe in the First Order. I just don’t buy it.