To implement crit strykes, developers have to bring just two new skills in the game. More criticals (more often) and better criticals (more damage with each crit. strike) That's all <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />
And, of course - death animations for finishing moves.
and slayer if you are melee, and sniper if you are a bowwielding kinda guy
