Its not very specific what do you mean by aiming
it makes the gun moire accurate when you are not aiming down the sight
Snap to targets by aiming in and out and headshots. lots of headshots
Modern warfare reflex and modern warfare are the same. Modern warfare "reflex" means that its for wii. If its just modern warfare its for the other consoles
Modern warfare 2
modern warfare 2 is better .
modern warfare 2
Call of Duty Modern Warfare 2
Yes.
Modern Warfare 2
Lightweight Pro increases aiming speed after you sprint. you can achive lightweight pro by sprinting 30 miles with it on.
Modern warfare 1 or 2?
No it is called Modern Warfare Reflex which basically regular Modern Warfare