Buffalo averaged 3.2 yards per rush the first game, while giving up 5 yards per carry. Today they averaged 0.8 YPC and gave up 4.3. I haven't watched much of their games, and the big leads may have played a part in these stats, but it looks like the Bills are a flawed team that isn't controlling the line of scrimmage. That will hurt them once they play better teams down the road.
Miami will be a good test this week.