Left 4 dead 2 does not work

It does work, especially on a Xbox 360.
Buuuuuut,
If you have a PC, the graphics are really high. I bought(I think around $600) a video card that much, but I still can't run at max setting, I still run at medium(If I run at max, I'd lag hard.) So yeah, it works, but graphics are insanely high so you need a good video card.