Same. Maybe i'm just a crotchety old reactionary but back in my day we just needed some random guy with a super shotgun and a chainsaw to... well I don't think anyone was saved but he definitely killed a whole fuckload of people.
The whole " doomguy is actually a magic space demon with a magic sword" thing has been very "eh, i guess, whatever the kids are in to".
Every DOOM mod is canon, so they say, and it's justified by Doomguy choosing to stay in Hell at the end of Final Doom or Doom 64 (don't remember which) to keep killing demons to take his revenge on them. Time is all fucky in Hell so for thousands of years he roamed around killing demons before they trapped him, and then we pick up the story on the Samuel Hayden (who is somehow also an angel) timeline where Hell is used as a source of electrical power.
Same. Maybe i'm just a crotchety old reactionary but back in my day we just needed some random
guy with a 
super shotgun and a 
chainsaw to... well I don't think anyone was saved but he definitely killed a whole fuckload of people.
The whole " doomguy is actually a magic space demon with a magic sword" thing has been very "eh, i guess, whatever the kids are in to".
The only background info we needed about Doomguy was that he's the descendant of the dude from Wolfenstein3D.
Aren't they canonically the same dude?
I canonically have no idea.
Every DOOM mod is canon, so they say, and it's justified by Doomguy choosing to stay in Hell at the end of Final Doom or Doom 64 (don't remember which) to keep killing demons to take his revenge on them. Time is all fucky in Hell so for thousands of years he roamed around killing demons before they trapped him, and then we pick up the story on the Samuel Hayden (who is somehow also an angel) timeline where Hell is used as a source of electrical power.
Eternal heavily implies this.
actual spoilers of Doom Eternal if you're into that sicko stuff
Doom Guy goes to hell one too many times, loses his mind, and gets Hulk'd