I didn't actually finish the 7.0 MSQ (I quit shortly after the awful "western" storyline), but the actual writing was painfully bad at every point leading up to that. For example, the way we know Wuk Lamat has grown as a person is because they say "Wuk Lamat has really grown through this adventure". Most characters appear to have the motivation of dong things because the plot needs it to happen.

Finally, the prior expansions had strong themes, from Heavensword's take on cyclical violence, SB talking about oppression and so on. Dawntrail doesn't seem to have anything to say (or maybe it's all at the end, idk). It was just really disappointing and I just couldn't deal with it. It's like it was written for children except it deals with dark themes. Like the worst of the YA section.

By contrast, I was a blubbering mess at points in ShB and EW. Especially the 5.3 stuff, holy shit.