One of my twitter friends (tweeps?) brought up a great point in a tweet yesterday about low level content:
Was Draynee@FlyDraenei right? Should there have been some low-level content for Warlords? I’m going to say hell yes. It serves two purposes. It splits people up so that there isn’t an overload in one spot and it gives you something else to do in case of a failure or just too many people for your liking.
In Mists we had the Pandaren starter zone for fresh Pandarian toons to start and level. Even if you didn’t plan on taking the new character to max level, you still had something else to do and see. In Cata there were new race/class combos. Even though they were made available in the pre-expansion patch, you could have been leveling one of those. In addition to that, there was the whole Cataclysm revamp. In Wrath, there were Deathknights and in the Burning Crusade you had 2 new races to play.
Warlords of Draenor is the first expansion to have absolutely zero low-level content. This among other things is why there is such chaos on opening night. To add to that, more players are max level than ever before with the 90 boost that comes along with the expansion.