Basically, I want a mapping app which looks at a long trip and suggests alternate routes based on traffic, accident reports, etc. and is smart enough to weight routes based on historical trends. Waze has much of that but could use the kind of tuning which Google should be really good at and the much larger dataset it'd get if e.g. all Google Maps users were contributing data points.
The only other complaint I have with Waze is the clumsy UI for searching & adding stops (not to mention the 1 waypoint limit), the former being an area where Google should be able to deliver huge quality improvements almost effortlessly.