WLD is a challenge to DM. It can get tedious and bore players. The only way I got through it was I removed the assumption that almost everything in there was to be killed. It opened a lot of role playing and politics in the place. Basically my player went around and united the many different factions and had them swear alliegence to the celestrials. Then with them united she lead them against the remaining devils and demons and other truely evil things. And from reading the epic dungeon, that was not what the writers were expecting.