It's an opinion much like your suggestion of not liking not playing.
I personally think they are pretty terrible as well. To me its like seeing a little kid's desire to feel likes he's killing everything and lots of it... All the while being in god mode or playing with OP mods like Russian Overkill an the like. (or both.) Seriously though, MOST people cannot beat one playing vanilla doom with no cheats.
Even experienced players that can. To me, its like.... So what? Its a bullshit .wad. Its like being proud you played through a terry wad. Don't get me wrong though. I love killing lots of monsters in Doom as well. In either a Huge map that has them spaced out into segments and NOT shove you into a room with lines full of revs, cybers, barrons, and chaingunners. Or in a megawad map set that had some progressions as you get further and further into the wad. The later levels will have what will feel like a "Slaughtermap" but you should be prepared making it that far. (Equipment wise mostly, but a little skill as well.)