One thing that does not make sense to me, but I am seeing more and more is people wanting to haul ass all the way to the end of the instance while leveling. Why? We are there to get XP. If I fly through to the end skipping bosses, avoiding fights and running to the end, you are not really maximizing your end goal of getting the XP. I feel like some tanks are trying to get me naked in bed without so much as a dinner and drinks. How about slowing down a bit and smelling the blood and gore your blade and watching all the XP pile up instead of seeing if you can get to the end in less time than you did it last time.
Also, I have learned a something new along the way. Lots of those old instances suck. They are cool the first time through, but after a while they get really annoying. Perfect example being Sunken Temple.
So, yes, I've completed it, even done the optional boss in the basement once though I couldn't get anyone to do it after that run because "it takes too long". Rather simply there are some cool things about this, but come on, doesn't it feel like its long and drawn out for no reason other than to annoy players. Kind of like BFD. Though I haven't even gotten to the end of that one successfully.