I don't think they are really similiar enough to make an easy comparison. They are really tailored to very different audiences. Take the combat, aside from a raid, WoW has a fairly slow pace to the fighting. It's almost turn based, in essence, and you can strategize a few moves ahead pretty easily.
Conan has more of an action RPG feel to it, and in some ways it's closer to a fighting game. You have three zones of attack, left, right and center. You choose which of these three to swing at depending on how your opponent is defending. But you also have combo moves to use, and you need to think about when to use what combo. You can also fake an opponent by hitting a few times from the left, having him reposition his defense, and then using a powerful combo on the right. It is fairly easy to pick it up in game, but it requires a greater concentration. Couple this with the fact that you are usually fighting two or more mobs, and you have a pretty frenetic fighting pace.
The setting is also dramatically different. It's like comparing Harry Potter to George RR Martin's Fire and Ice series.