as for the game, never played any of the l4d games, but this looks a lot more interesting than the original. I downloaded the demo for it back in the day and found myself bored in about 10 minutes or so. this looks a little more action packed and equally as mindless. good combo for some fun gameplay.
Just played through this campaign last night (though had to finish before playing the finale). This is easily better than the standard campaigns, just awesome! Great forest environments, loved the crypts beneath the church. Loved the atmosphere in the container yard when the rain starts pouring too.
But what's this business of having to disable other expansions and run console commands to get it working properly? Looks like Valve badly need to give these guys (and probably other modders) some support.