They need to fix server optimization (seriously) before tackling content that requires high levels of precision and strategy. I haven't even done the current dungeons because it's impossible to find groups for it, but from what I hear they become easy fast. But as Celeras posted last week with the Youtube video, it's obvious the game is not ready for complex content. If they did make "challenging" content prior to server optimization, people will become bottlenecked @ server issues and I guarantee that wont be fun for anyone. =/

As a casual player, though, I'm all for harder content. I'm a little disappointed casual is brought up yet again in relation to skill, but not really surprised.