After the Rage debacle, ID need cash, hence this low quality console friendly re-release.
I have the original 2004 release & comparing them I'd say that lighting & character models look better in the BFG edition but it all looks so...shiny. I hear that chunks of the original have been removed. Because Doom 3 is so generically designed anyway I never really noticed. One thing I did notice was that the game seamed easier than before. Could be just me though.
It's obvious this reboot is just out for cash after Rage bombed so badly. I guess if you've never played D3 before you could be in for a treat but get the original. I still reckon it looks as good as this cash in. I'm a rare PC gamer as in I have a 360 so if that's all you have this could be a good option but the gameplay is so old & been there done that feel to it that it won't even be considered a good console shooter. Either way my advise is to avoid this BFG nonsense altogether. Buy cake instead.