It’s pretty good for what it is. I can see many fans finding it to be great if they only came across it recently or was their first shooter/doom game.
I liked it for what it was, but I wasn’t a big fan merely because I expected the old kind of level design. I expected it with the 2016 and Eternal reboots, too and is why I’m not particularly keen on those, either.
I was and still am a bigger fan of the original kind of level design. Not quite open world, but also not just hallways connecting arenas/a straight shot through from point A to point B. Set piece design can still work if the entire level is the set piece and, IMO, better if it’s fully explorable and not something that funnels you down a single path.