You can't even compare pre-abyssea XI difficulty to WoW. They are two completely different styles of endgame. If you have a full wipe on Kings, Wyrms, ToAU/WoTG HNM then another LS got your kill and you had to try again the next reset.
If you full wipe in a 25 man raid you resurrect and try again until you call it quits. WoW is MUCH more forgiving of mistakes than XI which when looking at it that way, XI was definitely more time consuming and difficult.
