i think you opponent misplayed. i have third and he is an amazing ninja but shisui is great. shisui is no better than third and viceversa but shisui is easy to beat once you triggered his evasion passive i have beaten shisui teams and viceversa; once you know how to deal with his evasion passive he is easy to kill, same with third. if you blitz him before any chakra gain, or poison/burn him he can be beaten.