I too am not a Doom fan, nor am I very knowledgeable of the music tracks. However, out of curiosity, I have heard Doom: TDSOP, and I rather enjoyed it. I can see how this is the spiritual successor
Some of my most favorite songs that I've listened to are, in no particular order of least to most favorite: The Countdown, 31 Seconds, Icon of Sinwave.
And props to who ever put that voice Doom 3's primary antagonist into the ending of "Icon of Sinwave." I've at least played Doom 3 to recognize the awesomeness of that voice XD.
Oh, and I probably won't be torrenting this for a while, since my computer is filled with all sorts of music from OCR, and I'm afraid by adding more stuff, I'd be slowing it down even more. Then again, temptations may get the better of me XD, and I'll find a way around that.