I can't really explain why, but it really bugs me that the story of the instance cluster is completely unrelated to the expansion. It's breaking my immersion man. I'm in the end-game in Rohan, I'm progressing through the story, and now I have to time warp back. I know it's trivial, and it never bothered me with "Inn of the Forsaken" or "Halls of Night." I can only conclude that the fact that those instances were a free update and not tied to an expansion and new land mass has somehow influenced my position.