The graphics seem pretty good. Some parts no, but overall it seems like some pretty good seamless textures. Any idea if this is related to it being on BXOX

Not sure, but alot of arcade games from the PC do look better, but it could depend on your T.V possibly?

Graphics would either be the same or worst. Mainly because Doom was developed for the PC which has a smaller screen then a 46 HDTV.