EMP grenades are fine the way they are! They actually work properly unlike in MW3.
They are very useful to annoy these pricks who spam bouncing betties and shock charges all over the place.
I have a custom class on the PS3 version called 'Annoying C*nt', in which I use the wildcard Tactician and carry 2 EMP grenades and 2 Black Hats, along with Ghost, Scavenger and Engineer!
And all I do is run around hacking and EMP'ing everything that glows red!
I love this class!
Again, this isn't about equipment, this is about ground based scorestreaks which can't be protected by hard wired. If I could give my sentry hard wired I would.
If someone is using EMP nades on me I can switch classes, however if someone is EMPing my scorestreaks I can't just change my killstreaks mid game like you could in MW3.
Except streaks do take over the game. The streaks that are destroyed by EMPs are rarely used and it is mostly dominated by aircraft.
Not the to the extent of MW3 and MW2 from my experience. The excessive use of Preds (largely thanks to the useless Sentry Gun) kinda made it stale for me. May be some game modes make it too easy to get high end ones since I usually play TDM/KC/CTF. AGR is only good against tight small maps like Hijacked and against noobs. I'm usually the one who has to take them out so may be you've come up against people who aren't totally clueless? Alternatively you can operate the AGR so Blind Eye users aren't immune.
Ground War and Chaos are spammed with lightning strikes/hellstorm, which is basically the new predator missles (hellstorm more so)
And I don't really use scorestreaks that kill things. I was just running guardian/sentry today for some easy xp so I could reach Prestige Master faster and noticed how stupidly easy it was to destroy my stuff. I still dropped 3KD games with my gun but I could have had a ton more score/kills if it wasn't so easy.