Breakfast Topic: Which is the hardest class to play?

I have been informed by The Management that the answer to this question is a rogue. This is probably objectively true. Rogues are a finicky class to play. Gearing can be an inordinate pain, with new pieces of gear often requiring complete regemming and reforging for optimal DPS output. Rotations, priorities, and situational attacks are also quite complex, and I have a lot of admiration for accomplished rogues. I have a rogue myself, and if I'm away from her for even a few days, it takes me a little while to get back into the rogue play style groove. However, I cannot truthfully say that a rogue is the most difficult class for me. My main is a druid, and I have played feral spec since I started WoW (though I raid and run dungeons mainly as Restoration - I prefer healer queue times, who doesn't?) so roguish game mechanics are pretty familiar to me. No, to me, the hardest class to play would be a death knight.

I have never been able to make sense of death knight mechanics. I can recite them: abilities consume runes, which produce runic power, which is necessary for other abilities. In practice, though, when I play a death knight it always eventually boils down to button mashing, which is not fun at all. So, despite having rolled a death knight at least three or four times, each in an attempt to finally stick with the class, I've given up. Death knights and me, we just weren't meant to be.

I still don't understand why, though, because honestly the concept behind both death knight and rogue mechanics is really similar! It doesn't make any sense that I'd be perfectly at home with one class but not the other. What gives, brain? I feed you and give you sleep when you need it, the least you could do is be more consistent in your virtual-world data processing, okay?! Alas, I cannot change the natural order of things, and death knight mastery will likely remain my World of Warcraft white whale. What about you, fair readers? What is the hardest class for you to play?