Sanderson's work in the original Mistborn Trilogy and in WoT are his best work IMO. unfortunately, the care he put into writing those books to get them just right is seemingly lacking from his more recent books. The most recent mistborn trilogy is laughable. It lacks any real tension, and the fallback on the deus ex machina is very very frustrating to the reader.

Sanderson needs to focus less on being a "writing machine" and more on being a writer.

Some of Sanderson's contemporaries like Lynch, Rothfuss, and Abercrombie have avoided this trap a bit better, but they have also published less.