I have a feeling some people felt the same way about the Warriors of Darkness arc back in post HW where at the time it prolly felt like kinda neat but whatever. Only thing was that arc wasnt made as the entirety of its post expansion story, and I believe thats the number one problem why people arent as keen with the 13th story because it was the whole focus of EW's post patch story, rather than be a small arc within other arcs that slowly sets up the next expansion.

I for one at least am satisfied with the way it ended and it definitely feels like despite its execution, the story of the 13th is the basis for prolly a future expansion or side content waaay down the line.