If it kills things, it's OP and must be nerfed. Do u seriously care that much about being outsccored by a random infiltrator?
Ok then let's go with the overpowered list:
Kroguard, OMFG he has 40% DR all time, and when in Rage even MOOOAR. And OMFG he can restore his shields every 5 sec. OP
Demolisher: Spawn nuking a whole map in a fraction of second? WOOOOW Nerf NAOOOOO
MQE: Same as Demolisher but much more mobile and w epic debuff skill, OP as can be
Fury: nothing to say here, a walking BOOM BOOM STAGGER LOL machine.
Asari Adept: OMFG she eats phantoms for breakfast, dinner and lunch, NEEERF
Vanilla H.Engineer: chaining fire-tech-fire-tech explosions, Satan would cry OP.
Batarians: almost invincible while Falcon Pawnching Rofl MAO OP as hell...
man i can keep going, just name any class and it becomes op. If u whine too much about score, i can tell u that Infils are not gods, they depend heavily on their guns, are single-target bursters and TC invisibilty part doesn't work 75% of the time. Would i take a TC that makes u untargetable, but only gives u for example a 50% Sniper Dmg buff? yes i would any time, but as it is now, perfectly fine. Go home.