I read this while I was on vacation last week, and it was about as good as I expected -- you can see from my posts above that I came in with high expectations. For those who aren't familiar, Urban is trying to diagnose and explain why political discourse and behavior in America has become so toxic over the past 10 or so years. It's impossible to do that without getting into very firmly "this is political" territory so I'll just leave it there, but it's important to point out that while this book is political, it definitely is not partisan. He goes to great lengths to show how people of all sorts of different political ideologies can complement or damage social institutions, depending on their approach to truth-seeking.
Urban himself is a center-left lifelong Democrat, so he naturally spends more time criticizing what he sees as problems on his side of the aisle, but that's just because of who he is and who he knows his intended audience is. A conservative writer (like, literally me) could have written this exact same book with more emphasis on issues plaguing the right-hand side of our spectrum. You know the feeling you get when someone takes an idea that you've batting around for a while and states it more clearly than you ever could? For me, this is one of those books. There are little things here and there that I would quibble with, but nothing that seriously troubles his main argument. Strong recommend if you're looking for a book that defends enlightenment liberalism in a novel way.