Well, that bug is an obvious one to notice, but what about paths that aren't immediately noticable?

Eg:  That route could of lead the user off a cliff or through a mountain that has no roads, or down a gully etc.

You wouldn't  notice that unless you knew the area well.

This is where the consumer loses their faith in MS products.  They hear of something like this, and they then find it hard to trust that they are going the right way, and their money is well spent.

No one likes to be lead up the garden path.