I think the fatalities should be more cruel and real. For example, human guys without powers, like kano, shouldn ́t be able to pull somenones heart with his bare hands! Come on, guys where is the gore? Isn ́t it better to see him using his knife to do it? So he should stab the enemy several times and after, pull the heart out, while the enemy is still alive. Or even he could stab him in the stomach and get the enemy ́s guts out!