I don't find any MMORPG hard. Just like crsh said, just a bunch of time consuming things that make it "hard". Admit it, when ever you fight a mob in an MMO unless they are much higher level, it's always the same key presses and just bash until it dies. The only time you run the risk of dying is if you kill to quick and forget to watch your HP and sit down to rest OR you happen to afk in a bad spot.

The only thing I ever found challenging was working with a competent group. If all the Raids in WoW were SOLO, it'd be easy as pie.

We need monsters that trick us, ambush us, flank us, etc. Why can't enemies backstab us from the shadows more often?