I agree, but honestly, I don't even see what the challenge is. holy shit, it's a pack of Cyberdemons! now instead of strafing back and forth until I pump 50 rockets into one, I'll be strafing back and forth until I pump 500 rockets into ten! it's just a waste of time, I wish I could like have a cheat code where it takes some ammo from me and the damn thing drops dead.
one HR map had a clever bit, though, where there's a Cyberdemon blocking the top of a vertical staircase and there's just no way to get him to pass by. later in the map, though, you get up to a ledge that's perfectly aligned for you to aim your rockets through a window and blow that earlier Cyberdemon away, netting you a shitload of shotgun shells for your trouble.
Oh no, it's a Goomba!