I always thought of Brandon Sanderson books as kind of like of Marvel movies: not the best, but mindless and entertaining. This book really rounds off that comparison by also becoming bad. 

What was once quirky, clumsy attempts at humour and one-liners is now obnoxiously unfunny and cringey. All characters have become quippy and jokey, even when it doesn't fit at all.

What was once well-intended diversity of mental health, sexuality, race, and gender identity is now so oversimplified and out of place that it borders on parody. Previously characters were unsure about who they were and how they felt - now they rattle off DSM diagnostics. 

What was once cool tie-ins for fans who had also consumed other media from the same source is now mandatory reading that makes the otherwise very black and white plot line unnecessarily complex. Honestly, I don't really want to keep having to cross-reference to various wikis in order to understand the plot of my action-fantasy book. 

The plot is still cool, probably in part because I am invested after reading the past four books, but everything else was too weak for me to really enjoy it.