Can you play left 4 dead 2 on the ipad

No. The iPad does not possess the graphical capability to play a game that 3D-intensive. Besides, it would look crappy on a 1024x768 screen, and you wouldn't be able to play it without any buttons. Even if the buttons were onscreen, it would take up half the screen to make all of them big enough to press. And I won't even get into moving the in-game camera without a mouse or analog stick.