Halo:Reach has the new animated assasination thing going on, purely for humiliation purposes mind you as a regular back smack is still an instakill. This leaves the attacker vunerable for a second or two, and can even be interrupted by the victims team mates, who can even save his life. So what if ALL melee attacks had this animation technique, showing the attacker disarm his enemy first, jason bourne style, before killing him with....bare hands, knife, environment....but also leaving himself open to attack from others? Much more "realistic" in the sense that having a gun doesn't mean that your indestuctable, but that charging in with a knife/punch is also not a guarantee of victory either. The animation could even trigger an offense/defense sequence between the combatants, via a quicktime, or rock paper scissors type interface, meaning melees will become a specialist tactic that must be practised to be effective.