Personally, i enjoy a game with various levels of difficulty. WoW gives me that. You've got the easy bits, and you've got the uber hard bits.

In some of its more interesting encounters, the strategies needed are quite challenging and really fun to work out. When you beat the "boss", the feeling of accomplishment is nice.

RL > WoW, for sure. But as far as games go, WoW > everything else, for sure.