I used it on my fury/rabies druid and my main complain isn't the damage, its the speed. With maxed HoW, I do at around 2K maxed damage un-upgraded which is decent but druids are just terribly slow with swords.
Since its PvM, I think it'll do fine upgraded, just don't think its comparably to a Tmaul, BoTD etc.
The +5 bonus to rabies is really good though