I had this version in the 90's and played it while a teenager.  I now repurchased it and am playing it in 2008 as a 28 year old.  It is STILL visceral, brooding and epic in its dark atmosphere.  In some ways, the minimalist "3D" of the original DOOM (particularly in this port) lends itself well to the overall gloomy atmosphere.  It creates a certain... menacing bleakness in the landscape.