You have to keep your wits about you if you pass through any one of many construction zones. Navi-lady doesn't know when they block off a street!
But she doesn't rely on street signs, so that's a plus.
What is unique to Boston is that major potholes are flagged with a huge "black hole" symbol, with the decade of their creation marked clearly. I don't think this is done for other cities where their locations can change.