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In your local area, you know the "right way" to get from point to point. The software doesn't have that local knowledge, so it has to use some algorithm to pick what road. The average speed of each road segment is stored with that segment, for example, to allow the software to pick the "fastest" route. If that recorded speed doesn't match what actually goes on, then it will pick the "wrong" route because it doesn't have that local knowledge. In my area, for example, only one package picks the right route from my home to office and return, and it only works because I contacted the company and complained and they changed the speed on a portion of my journey to make it faster (and match what goes on in reality).
In a foreign location, however, the software will definitely get you there, although it may take a strange path. On my vacation in UK last May, for example, I used it to get to a certain pub for dinner. I followed the software blindly and got there mostly by country lanes. When I had the opportunity to plot out where it had taken me, I discovered I had been parallel to a major highway that I would personally have preferred, but to use that route added one minute to the journey and I had chosen "fastest" as the route. It wasn't "wrong" but it wasn't "right" either. The lesson learned is to let it plan, then review what it says to do before you blindly trust.
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