not every hero need to look like the unbelieveable Hulk!
And: not every hero has to be that "cool" that all emotions run away...
I like heros which are fighting with "themselve" too, to control their power. DMC4 is hard, so hero could look like he is trying as hard as possible.
I hate all cutscenes in which dante destroys the little hellgates. Just eyecandy and to much colour, nothing serious or funny!
Heros who are knowing everything and killing everything like a someone on his sunday-morning-walk are boring !
Yes nero is young. Yes nero is a bit shy. Yes he is a child.
But all this is only at beginning. He is growing up druring the game like you can see @ending with dante and something nero would not have say before: "Thanks !"
Maybe the role of Nero isnt perfekt. But i think its better than the role or acting of dante !