If the quests are engaging, fun and tells a intressting story about why you must brave the dungeon, would you still call it a time sink then?
A one time deal that takes like one hour to complete, much like how the job unlock quests work.
Or are you of that modern mindset of "get to the loot faster!" and skipping every cs and story?
What I'm asking for isn't pointless attunements just for the sake of it(like having to clear DH before Vale etc), what I want is reason for my character to go slay the monsters inside, instead of just doing it just "for the epics!".
Quest to unlock jobs, quest to join GC etc, is a waste of time to you?
Just because its a requirement doesn't mean it cant be intressting content.