Both maps & GPSs have their advantages & disadvantages.  I use both & do my best to choose the system that makes the most sense for the situation.  For example, it would be impossible to carry county/town level road paper maps for everywhere in the US; a GPS does a great job at this.  On the other hand, looking at the "big picture" doesn't work well on a GPS.  Pull back and the secondary roads start to disappear.
As to poor GPS routing compared to maps, I still remember back in the 70's when AAA routing me on County Rt 3 between Alma, CO & Leadville, CO.  This is a old dirt stagecoach road that goes over Mosquito Pass, requires 4 wheel drive, & usually doesn't open until mid July...