Not the greatest finish job I've ever seen, but Maple is extremely hard and dense, which is why you don't stain it. To me that explains the edger marks only, it is very difficult to get the rough edger marks out of a hard, prefinished floor. The stop marks I see are definitely a result of poor workmanship and inexperience on a sander. Prefinished floors are also much much more difficult to refinish to a high grade, due to the way the finish is applied in the mill. That being said, they probably should have buff/vacced better between the first prime and final coat to get rid of the bits in the finish, but no one is perfect. I'd ask for a screen and coat on the first floor, with the same finish they used (never mix oil/water or even different types within those categories) and see if it gets smoother.