Thats because MW2 was agame for kids where anyone could have a positive KD ratio by getting 5 kills and watching the stacked kills roll in. You can't play this game like Mw2 where the AI gets half the kills for you. Which is probably why you are not doing as well as before.
Now you have to shoot stuff for KD it makes a huge difference![]()
The killstreaks in MW2 I used were UAV, CUAV and Stealth bomber. I used those for 2 prestiges no deviation. So nah, I didn't atall rely on killstreaks in MW2.



