It only lasts for 40 seconds and can be countered by a single perk. Why does anyone bother using it? Chances are if you get an EMP the enemy either A) doesn't have scorestreaks or B) their UAV can be better countered by a CUAV or FHJ.
CUAV > EMP AGR > EMP Escort Drone > EMP Lodestar > EMP etc. etc.
Not quite. That same perk counters CUAV, so that's null. The EMP also counters the UAV streak by destroying it and preventing its use for that time period. The EMP directly beats pretty much every other streak in that sense. Hardwired is also the least used in its tier.
>implying people use hardline on even a single class
If you go VSAT > EMP you get your dogs or swarm free.
The EMP doesn't help in getting the dogs/swarm at all though. Like I said, a CUAV, FHJ, or hardwired would do the exact same job. You can obtain 3-4 CUAVS in the time it takes to earn a single EMP against semi-competent players. The EMP is also worthless against people that aren't good. It doesn't have a niche and is severely underpowered.