Can you give some more input on this?
I feel my hometown program might have given me one, but I really liked their program and do plan on ranking them either #1/2/3.
I'm not a fan of the courtesy interview for exactly this reason--it leads to unnecessary second guessing. As gutonc said, don't focus on the program side. If you were invited, do your best to make a good impression and follow up according to the program's post-interview contact preferences (if the program doesn't state a preference, ask the PC). Rank the programs as you like them without any regard to what you think the program will do. That is the only strategy that gives you the best chance for a happy Match outcome. If you like a program but don't rank it highly you'll never know if you could have matched there.