It's probably pretty low on my list, but it has been ages since I've played it.
If we wanna be a bit cheeky and do a little ranking of the officially (semi-official?) released episodes/map packs? I'd probably do:
No Rest for the Living = Plutonia = Sigil = Knee Deep in the Dead > Doom 2 > Shores of Hell > TNT: Evilution > Master Levels for Doom 2 > Inferno > Thy Flesh Consumed (like two maps that I love, and a really uneven progression/difficulty curse)
Like I said, it has been a while since I've played some of these, so my list may change quite a bit, but I plan on playing through all of them again with these releases. I'm just currently held up on playing through the incredible
Blood: Death Wish 1.6, and then it'll be back to Doom.