Modern Warfare 3 Multiplayer/General Gameplay Ideas

I thought since my other one was doing okay I'd start this. For Killstreak Ideas i think one that makes you invincible for 10 seconds or near enough invincible would be good for objective gametypes and would require 10 kills. Also I want to point out that i invented the tactical nuke. can't prove per say but when MW2 was announced my and my friend were talking i said "wouldn't it be great if you could get a nuke killstreack for like 30 kills" I then put that on the iw forum thingy. I'll see if i can find the post. So Ideas like Guns, Perks, Ranking and kill/Deathstreaks