What I found by watching a twenty-year-old Doom II deathmatch - eviltoast
Galiu vs BahdKo in Montreal, January 1997 I use this 20-year-old match to take a peek into the competitive Doom scene in the mid-90s. http://www.doom2.net/doom2/lmps.html

Cool little video on this person watching a doom 2 deathmatch demo