My first Doom experience was the PSX version, and we all know the ambience of that versions soundtrack sets a very dark creepy tone that many argue fits this type of game, me included.
But does that mean that the original is bad? And doesn't fit at all? Of course not, and not for just being the original but it fits the game in a different way.
I decided to play some Chocolate Ultimate Doom to take me back what made me love Doom in the first place, and with the capped fps and the old style sounding mus music this game can still get you quite spooked. And the more I play the more the music makes sense. Let me try to explain from my perspective, others may differ:
The music for he first episode, set on Phobos, I find is generally more upbeat with a general "military" feel. From a story point of view, the marine really hasn't figured out what's going on yet, it's treated more as an alien invasion with the music more action orientated, the moon is still physically unchanged by demonic forces until you get to the last map where the music is suddenly more gloomy and makes you feel hopeless for what's to come, that this goes deeper and the invasion is far from over.
Then we get to Deimos, and the music sets a different tone, E2M2 is a prime example, you really do feel alone and isolated whilst these moon bases have demonic architecture scattered around them as something evil is taking over, and the Tower of Babel music really does suit your first encounter with the Cyberdemon, The Shores of Hell soundtrack is more Horror/Gloomy.
And finally Inferno, The Marine at this point knows the deal, he is in Hell, and the music reflexes this, it's unsettling music but with a touch of all the above, action, horror (reused songs) all mixed into the Doomguys final push in the original Doom.
Sorry if this dragged on a bit, but hopefully you understand what I mean. the PC Version rocks in it's own way like the PSX Version rocks in another.