It is also ment as an assasination/silent kill.
From behind that is
Maximum strength - does it ring a bell? It does not say it out loud as it did in Crysis 1, but suit makes a lot stronger than normal human.
It should use energy in that case
BTW: What about COD and 1 hit 1 kill?

BTW2: It isn't OP when you play game without lags and hit detection is working properly. So after some patch that will fix messed up net code, it wont be OP at all. Its the same as COD or BFBC2 start when it all laged, everyone was knifing and now when its fixed, you almost never have a chance to knife someone.
1: I don't play CoD

2: Either way I'm still terrible at melee fights XD