I repeat, casual =! easy.
Casual is a term used to denote how a player is rewarded, regardless of skill, effort, or investment into something. Think of a casual golfer plays golf to socialize and relax, or a casual driver moves around to get away from life and enjoy scenery. In a similar vein, the casual players of WoW were roleplayers, or people who ran PUGs for entry-level raids, or only logged on to run battleground weekends. In other words, the casuals, 95% of the game, would just dick around in a virtual world after most chatrooms shut down but before Facebook dropped.
The CASUALIZATION of the game itself didn't start because of them, it started because the top 5% of players were bored. They didn't enjoy socializing, goofing off, or any of that nonsense, they were scheduling raids and performing them with mathematical precision. They were trying to "beat" an MMO, which is impossible, but that wasn't their mindset. When they broke a barrier, they demanded more, even though Blizzard was catering the game to the 95%, and not the elitists. In order to calm them, they inducted one of their own, a former raid leader from EverQuest, into the developer ranks, and then everything went to shit.
It was no longer about what a class COULD do, it's what a class SHOULD do. If it can tank, it should have a dedicated tanking spec, a dedicated tanking set, and dedicated tanking abilities. Forget about generic class sets, forget dungeon sets to reward FILTHY CASUALS who can't dedicate over four hours at a time to inspections and loot councils, forget about all of that garbage and focus solely on tiers, with a set for each specialization! Also, why should I have to grind through raids again? Let's introduce dungeons to skip content that the majority of players have never been in, so I don't have to waste time!
This mindset, this casualization, is why we are mad. Look at Legendary Weapons as the definition of reward with no effort.