Archer still does a lot of damage, helpless is still 100%, but the amount of ele res it debuffs has been reduced to put it on the HH one which is an aoe, in fact the total amount of ele res an archer debuffs has been slightly increased
Of course you wont be able to kill all classes, if you would been able to do so, that would be unbalanced af, summoner is the best damage dealer, but if you combine archer and another class like hunter or orbi (which is what you have most of the time) in infernum then archer would destroy anyone
Of course if you are alone against 2 or 3 guys you wont be able to do anything else than run and that is normal
So stop complaining