It's similar...just less. No reloading, taunting or any of that.
WSAD for movement
Ctrl - crouch
Q/E - switch to Orange or Blue gun (not that neccessary...it's also set to the left and right mouse button)
Space - jump
That's pretty much it...
LEFT4DEAD411.COM
Bet with disolitude: Left4Dead will have a higher Metacritic rating than Project Origin, 3 months after the second game's release. (hasn't been 3 months but it looks like I won :-p )