The problem is 95% of players are running a shotgun and you will take a shotgun shell to the face. Regardless of the damage it does, you're still going to die more times than you get a kill. The vast majority of kills are going to come against players that are in a gunfight with someone else. You would have killed them with your gun, anyway.
To be honest, most of what you've said is extremely situational. You're not going to get a chance to knee someone in the face Nova Bombing or Fist of Havocing you 99.9% of the time.
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^this People say shoulder charge is OP but any decent shotgunner kills you.
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Agreed. Shoulder Charge is most definitely not OP. You cannot use it and dominate in any lobby with competent players. Anything that is deemed as OP should be able to dominate almost all of the time.
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*cough * thorn *cough*
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Agreed, I almost never get killed by a shoulder charge, or use it to kill an enemy.