could be better say if you have nice crit, but sadly im sitting around 23% and when sword spec proc the hit usually ranges from 160-400 and maybe 500-600with a crit depending on the hand it proc'd on, so to be honest i think 2dirty deed's might be better in my case with lower crit, where as 1/2DD could be better for someone up around 26-30crit.
but i dont know i could be a hundred percent wrong never liked combat so never tried to learn much about it, i also just get bored spamming SS that i usually drift off to wonderland and never notice what my sword spec is doing dmg wise, but when i do look it just always seems to of made the OH gain the extra attack which sadly isn't that impressive.
i might switch to two heavy hitting swords just for fun, i can shiv poison's up.