Boy am I excited for L4D. I got to play it at E3 and it was fun as hell, and although I never trust console ports of PC FPSes, at least Valve is doing it right. Playing online will, if I read this correctly, always take place on a dedicated server, which means no more juggling connections to find out who’s the best host. DLC (new weapons, maps, and monsters) will be quicker to come than for TF2, although hopefully just as free.
I don’t think you’ll be getting the “real” Left 4 Dead in the 360 version, but at least you’re not getting a hack job.