It is my opinion that DQs and WQs, that when used properly in combination, can make a much more satisfying endgame questing experience then simply one or the other. As someone who hit 3 different exalted reps today (for 16, 17, and 18th exalteds for those counting), I firmly believe that both used in conjunction would make a more diverse system that would let the player choose their pace and their content.
Don't like quest hubs? Do WQs.
Don't like WQs or just enjoy quest hubs more? Do DQs.
Really want to get that rep/item/whatever faster? Do both.
WQs seem to me to be like icing on the cake, but are really lacking since there is no cake to spread them onto. DQs the reverse. It's like strawberry shortcake with just the buns.
Get both together, and you might actually have a decent endgame questing system.