Click to view Here ya go, 15 minutes of direct feed Left 4 Dead footage. If this doesn't spark your interest, then we really don't know what will. Perhaps Left 4 Dead paper hats and party streamers? Perhaps. Left 4 Dead Direct Feed [G4TV via VG247]
I'm still going to grab the PC demo and give it a try, but if anything this video turned me off to it a bit.
The main thing I saw is that the pacing is dictated by if your team decides to follow you or not. Even on the first level of this video the player must keep returning to try and get them to follow him while they just stand there waiting to be eaten.