As pointed out, I think more people complain about the rotation rather than teh GCD. The GCD, to me, is quite alright. Given that it means that youre not spamotarding every skill every five seconds like some combat MMOs do, it actually gives me a bit of leeway so everything doesnt seem so frenetic. Thinking room, so to speak. That being said, the rotation (once you learn it more or less), leaves much to be desired. In reality, once you do your opener, its rinse and repeat a rotation till the boss dies. There isnt much in the way of variety. You use a very small skill set over and over, and pop oGCDs almost on CD. No real thinking about "what skill to do next".

This has its benefits, as you can train a player to do their rotation, and have them more focused on fight mechanics. This allows boss encounters to be more dance and show. Drawback is when there is no dance and show (or when youve gotten used to the fight), the rotation becomes more obvious and repetitive.