I used to swear by Waze, proselytizing to anyone who would listen, and otherwise. There are two main reasons I stopped using it altogether.

1) As tends to happen with our favorite apps, they started fucking with the UI. I don't remember exactly what it was at this point, but every release after Google's acquisition included some changes that made it less convenient and more aggravating.

2) I gave up having tower service and went wifi-only. Google Maps is very good at storing the map offline and recalculating without an Internet connection. Waze needs an internet connection every time a fly passes between you and the GPS satellite.

I still miss the police warnings, but I also changed my driving habits to where I don't need them anymore.