For example, they want to make this nephalem valor the center point of the end game, which is kind of weird, but ok.
Yet, they could not implement something as simple as being able to reconnect after a network issue without losing the buff, which is the whole point of end game, according to them.
Many similar examples.
The Auction House, another important part of the game, look at how terrible the UI is, can't search for more than 3 affixes, have you ever tried searching for 'Has Sockets' = 0? yeah, it doesn't even work.
Have you tried searching for a shield with a specific block value? how about an off-hand mojo or source with a certain damage increase? You are !@#$ out of luck, this is worse than a webpage in 1996.