I stopped using Waze last year after it started consistently giving me bad directions that would add 30-60 minutes to my commute. After a few weeks of that, I just gave up. Before that, it would periodically give me bad directions and I assumed that it was sending me on crazy routes because it didn't have any recent data and it needed a victim to check the traffic.

The time it sent me along a street with 2 school zones during bus time was the worst, tho.