I honestly can't even remember the last time I saw a Doom in one of my games. He really isn't good in the current game climate. Hero is too one dimensional and that is his downfall. Doom is now a mediocre ult without Aghs.lol, me and volodja were talking about that earlier. Hero isn't good at anything. Doom isn't good, survivability isn't good, gpm boost isn't good since your other abilities cant be left at level 1 while you max devour, righclick doom isn't even ok.
IMO there are a few approaches that could make him better, and I think doing something to Scorched Earth would be a good start. The Sniper Aghs approach is valid if all else fails.