I don't think they are OP at all. I think that the concussions are, they stun enemys for to long. The EMPs have no effect on players other than they dissable your Optics and your HUD. The AGR is not that high of a scorestreak if you play objective gamemodes, which is what the EMP is usually used in. I agree they should be unlocked at a higher level, but I do not think they are OP. When you EMP someone they still have a good chance of killing you, so it doesn't really hinder you if you are hit by a EMP. They also are not used as much as the concussion, they are very underestamated. I still do not belive they are OP at all. Hope my insight helps:)
I still don't see many people using an EMP grenade. Most of the time I'm the only one and I don't understand why more people aren't using them. With Engineering I can easily get 500+ points per game with the EMP alone. Equiped with Scavenger and only dying 2-3x a game I'll end up with massive Streaks and a crazy K/D to add to my easy win
EMP is fine the way it is, not too many people use it because they rather carry flashes, concussions and god damn shock charges.
Only thing that annoys me is that how some people just spam them at you, it is annoying to lose the hud in middle of a fight where enemies are coming from every direction.
EMP grenades are meant to take out all sorts of electricity.
It was awesome how they took down PaveLows in the Wii version of MW3.
Due to the fact that you can't change your streaks midmatch like in MW3 it's good that you can't destroy higher streaks with the EMP grenades this time. Do they work on escort drones in BO2?
I think the only annoying thing is the duration of the effect on target players. But nothing worth changing in my opinion.