I've never been impressed with their route selection. They just have different priorities than I do. While I prefer quiet roads, even if it means many thousands of feet of climbing per day, ACA prioritizes flatness, which often means much higher traffic volumes. I find that I am happier with the routes I select, even in areas that I have never visited, than I am with the ACA routes.
With the internet tools available today, it is even easier to map out your own route. Of course, the best roads won't have any Google Street View.