Game pad controllers are not supported by Modern Warfare 3. Please check our controller page for information about how to hack controller support into the game.
With some users, a black screen will display on start-up, though game music can be heard in the background. This is caused by a collision with the Mumble voice client. Within Mumble, be sure to disable the in-game overlay.
This is a Microsoft C++ bug so the quick fix is to uninstall your C++ files. If you see 2 instances of Microsoft C++, uninstall both of them. There are also a couple workarounds online if you don't want to uninstall them.
C:\Program Files (x86)\Steam\steam.exe -install D:
Set Image Quality to "Native", as "Extra" up-scales the textures resulting in poor image quality.
Appended the game laucher with -dx9 to force DirectX 9 compatibility mode.
"seta rRendererPreference "Shader model 2.0""