Limited recollections from past interview:
Strengths: High volume tertiary referral center, large program that is fairly balanced in all areas including cath/EP/transplant/nuclear, good mix of basic science/clinical work that few programs have, huge transplant volume, large EP and cath programs if you want to stay, payed to take call
Weaknesses: Large program (if you think this is a negative, one of largest programs in nation), the city of Pittsburgh (depends on who you talk to), overnight call
As for national reputation, I think this is pretty subjective outside of a few top notch programs in cardiology (i.e. Duke, Brigham, Mass General, etc). I would say you can argue a huge number of programs fall outside the top 10 but in the next the next tier of programs, including Pitt. Rankings aren't nearly as neat as they are for medicine. Look for mentors you think you're research is going to match and strength in the area you're going into. If your primary focus is research and academic medicine, NIH $ is a somewhat objective measure.