I actually like reading Nate Silver's tweets about this, because he's actually looking at the data, and what seems promising vs. what doesn't seem promising. As an example, he thinks Washington State's progress is good, as the % of a positive outcome per test is staying fairly low (5-6%), and they're doing more tests than the average state. On the other hand, NY has something like 9-16% positive test rate atm. He attributes it to Seattle and Washington State locking down earlier than most of the country, and we're starting to see the results of it.