One thing I noticed, everyone on WoW fansite are pro and think this game is too easy, but in-game is SO different.
Why do tank leave because of wipes, if the game is too easy, when it's easy, you just don't wipe. So it's not easy. You will always need to deal with AFK, bad or whatever you want, so if most LFR failed, Blizzard will reduce the difficulty after a while.
P.S. If you think a player is bad because he don't watch and know the fight, you are wrong. What's the point of doing raids when you know everything before doing it? I remember I had difficulty killing ACT2 boss in Diablo 3, and I killed him by myself without the help of internet. Maybe just because when I started playing videogames I didnt had internet to tell me what to do.