I guarantee you that more peole had known Chen Stormstout, then Deathwing. When was Deathwing?Warcraft 2?Cant recall it to be honest. For most of the people it was just a giant dragon flying over teh world destroying everything, and looking cool. You dont learn that much about his reasons while lvling through the quest areas. MoP has more lore then every other expansion (maybe wotlk is on par, and classic not counting obv). Why should everything just based on the past? Introducing new continents, new lands, new areas are way more fun. After doing every quest in MoP you learn everythign about the country. The hatred, the wars, the alliances, pretty much everything.
After I leveled through Cata or Burning Crusade I had too many questions still opened.
If major characters like Garrosh and/or maybe Andruin dies, is MoP then really a filler expansion? I doubt that.
IMO TBC was butchering too much old characters like Vashj, Kael, Illidan. I kinda dislike and hate it at the same time. This allowed WoW to be able to introduce new lore, but it killed these characters way to easily.
Why are daily quest no content? Alot of players are enjoying right now daily quest, they were just a bit overwhelming at the start of the expansion if you want to get super fast geared and get burned out.