Originally Posted by
Niberion
Lets see, BM hunters pretty obliterate Demo locks with their initial burst and cc chain. Unless the Demo lock is speced into Dark Bargain, it's pretty much game over if the hunter gets the opener.
Sub rogues have little problems as well and same goes for monks and death knights due their high amount of anti-caster abilities. Both Affliction and Destruction warlocks win it as well due having the same tools and being able to outlast demonology. Warriors have very good chances as well as long as the warlock doesn't have his gateway out LoS as the Demo Lock has to save his biggest burst till the end and the warrior has enough mobility to stick on the lock long enough.
Shadow priests do fine as well if they can keep their dots up and counter-act in time. (Imp can be a bitch, but so can VT be, it's a 1/3 chance your silences/fears/etc will get dispelled).
Honestly, Demo warlocks are strong when it comes to dueling where they can fully prepare against what they'll be fighting, however, after all the nerfs they are really not that strong. I think many people are completely overestimating Demonology or haven't done a single duel after all the nerfs.
That being said, all of this only counts for duels, in any other form of 1v1 such as in battlegrounds and world PvP, Demonology is a lot weaker due not having gateways and portal set up, not using the right pet for a certain class, etc. Purely looking at duels is just silly as that's really the minority of 1v1 going on.