I am leveling a warlock and hit 45. I have around 130 spellpower on gear and its insane. I am soloing very hard quests and most elite quests. Otto and Falconcrest ez. Forzuk and his merry band of minions also easy.
Granted, my first level 60 was a horde warlock so I know what the class can do. My best feat on that toon was soloing the 5-man maggot boss- the quest you get from nanathos on horde.
I have the dreamweave set, gloves/helm, robes of power(14sp), 21+14 shadow damage shoulders/cape, hypnotic blade from sm with 30+ spellpower. the shadow orb from the warlock quest.
I can’t even play my bis spec in dungeons because I pull too much aggro off the tank. lol