The problem is that affliction's main damage is 20 stack agony which takes like 30 secs to reach 20. So basically untill that point if you cant spam UAs on the target, you will die faster. You cant really kite because of the lack of slows/snares etc. Basically Affli is rly bad for 1v1 against melees.
Dang, that sucks to hear from someone who's 3000. Do destro and demo fair any better?