I always though Doom was best as an aura whore
Valds/Drums/Shivas/Devour an Alpha Wolf/Radience/AC etc
The combo of bloodstone/ac makes him very hard to kill while your team benefits from the multiple auras. By no means am I at a high level of dota (3.1 MMR currently after peaking at 4k), but so far it has worked out for the way I play. It could just be a fluke though. I'll know more after some more matches.
I do think saying he is only good for his Doom spell is pretty ignorant of how helpful his auras can be.