Don't take this as a defense of the hospital, merely a statement about this particular article. I'm not saying the article is wrong, I'm not saying that this actually is a good hospital.
I am not a expert in pediatric cardiology/cardiac surgery; however, I do know that it complicated. I think it may be a bit unfair to compare numbers from one facility to the next without any sort of context.
When I was a kid, the local paper in my hometown of approx. 100,000 people published data on the cardiac surgeons from the 2 hospitals in town. They singled out a surgeon who had some of the worse mortality numbers. It was brought to my attention by a family member (who was not involved in the data and has no connection to the surgeons, other than the fact she worked in one of the hospitals--the one that this particular surgeon did not work for) stated that this doctor is known for taking high risk candidates, which was reflected in his data. We can certainly question his judgment about taking high risk patients, but the article basically said, "his number are the worst, don't go to him," with no context or background given on said numbers.
Again, I'm not saying everything was fine at this hospital in Florida, but I'm going to reserve passing judgment until we know more about the nature of the patients--which is information we may never really know.