I don't think it was a-typical. Yeah, the action and fight scenes were more predictable, but there was a certain badass about Castle that I have NEVER seen in action heroes. He fears nothing, he gives a **** about nothing, and he just revives that whole invincibility thing.
He has no time for anything or anyone. For example, (**semi-spoiler**) When dave knocks on his door to tell him that crazy guy was in her room, he said nothing, just shut the door. The only thing going though his head was "someone's *** is about to get kicked". He proceeded to drink more wild turkey, put on a clean white tshirt, and prepared to ruin someone. (because all asskicking must take place with a clean white tshirt, as opposed to remaining shirtless).