Not a huge N64 fan, but when I finally got one a few years back, I did get Doom 64. I'm not a huge FPS guy, but I do like them up to, I dunno, maybe Quake? Anyway, I did really like Doom 64 when I got it, except for the terrible, terrible gamma settings where I would literally have to turn up the brightness to an unacceptable level on the TV itself to play it. Frankly, that was a big enough pain that I wouldn't play it very often.
Anyway, I can't imagine every playing that version again. This Switch version is excellent. Plays great, you can actually SEE it... great job by all involved. Just a really good Doom.