i wouldnt call
wow that much "high" fantasy - ok its not feudal europe in the 13th century mmog where there is perma death from the plague set at 30% chance per hour in game or warts or mud or whatever =)
the quests are actually well thought out and form logical little storylines which teach you how to play the game and learn new spells and combat abilities as you go
you actually level in an IC manner if you quest
so my undead mage / herbalist / alchemist actually learns about it as he grows in levels.
you also get to learn about whats happeneing in the time frame of the game abotu current ic events and stuff.
but its really about a war between alliance and horde - which is pretty dirty and grubby low fantasy i reckon =)