There are indeed many reasons players are starting to feel bored with the content.

For me and my guild, the difficulty of entry level raiding is causing many to turn away from the game. We struggle at this point to barely get a ten man going, and when we do, we constantly have to ask different players to heal, since healing is an extremely stressful proposition now days.

Having an inconsistent heal core turn up each week is not a good thing. We've been able to slowly make our way past Magmaw, Omnotron and Halfus, but took a step back on our last raid when the raiders asked to heal weren't up to the task. We spent three grueling hours wiping nonstop to Magmaw, a fight we thought was safely on farm at this point.

Going from an extremely accessible, casual raid environment into something that isn't is making a lot of players feel kind of jaded. A lot of people I've spoken to are hoping the 353 gear from ZA/ZG helps things out, but for many, the damage being done while we wait for things to get better is causing quite a few guilds to break up.