Skill is something that can't really be communicated from one person to another. Ya, changing sensitivity may help but the only thing that will really help is experience. However, I use a PC contoller that has longer analog sticks (FPS Freeks work in the same way) and that actually does help. Also, there are ways that you can connect a mouse and keyboard set up to a PS3 (using a third-party product like the EagleEye) and that will DEFINITELY help your aim (WAAAAYYYYYYY more than even obscene time playing).
Play like it's Call of Duty.
I am serious. The M9 is THE best weapon, in every single possible way. Just CoD it out.
Exactly. Kudos to you.