Only problem is there is only so much you are allowed to do.
You are confined to the game area parameters, and usually can't go back to wehre you were very far.
It's always the same villians you have to kill, always in the same general area. You can get more stealthy, or use different melee weapons or guns (what ever that chapter allows you) to execute them.
The games are awesome, but limited, that's why I liked Bully better.....You have free reign over the entire area.