Not a bad airport. It's clean, functional, easy to find your way around with signs big enough to read from a distance. What I like best about PIT is that no matter where your flight is headed, you never have to walk far from one gate to another. That's a bonus when you have a tight connection and a carry on with no wheels. (does anyone have those anymore?). Security was efficient and pleasant, almost like they actually saw everyone as a person and not as job.
The shops and restaurants in the airport are a good mix of retail so there's something for everyone. The one not-so-good aspect, if your flight is later in the evening (after 7 or 8), then quite a few of the shops and restaurants will be closed, leaving you with few options to wile away the time.