Having been a cox customer with an inquisitive mind and tcpdump, I can say that they would certainly benefit from a fairness queue, even if they don't sort it by traffic type or destination. A single client should not be able to take and hold 90% of a segment no matter what protocol they are running. Even if these were just tiny routers, one per segment, this would be a drastic improvement.
My gigabit MPLS peering routers will be very disappointed to learn that they are not real.