I am a little curious how intelligent he is. I wonder if he's going to be like Jade Empire's The Black Whirlwind, Origins Oghren as was mentioned above or Mass Effects Grunt. That or perhaps he's going to be both savage and cunning along the lines of Rex. At least that's how I see Rex considering he's not only a fearsome mercenary but a skilled political leader. For a krogan.
I'd prefer if he was both fearsome, so that at a glance he would seem like a brute, and highly intelligent. The intelligence typically coming out in his battle plans for when he considers you worth speaking to instead of chopping up. Fearsome and strong doesn't have to mean stupid after all. Fearsome, strong and cunning is even more frightening.
Plus I just think it's funny when the big stoic quiet brute turns out to have the mind of a scholar. He just doesn't consider most worth speaking to.