While I've only played about the first half-dozen levels from Doom (not Doom II), I haven't noticed anything different from the PC version. I'm psyched about the availability of split-screen for DM or co-op, as I don't recall it being available on any other version. The closest I had come was through system link on a pair of PlayStations. Does anybody know whether Doom/Doom II are playable over a 4 Xbox LAN?