I have zero complaints about this airport. It is really fantastic.
Pittsburgh International is very easy to navigate around. For a larger airport, the gates are set up in such a way as that all gates, no matter which airline you fly, are centrally located and extremely easy to get to. Sort of like a star pattern, with the main hub in the center.
I can't let this review go by without mentioning the way cool dinosaur skeleton that has been in this airport on loan for as long as I can remember. Good Ole T-Rex, very visible on your way down the escalators toward baggage claim.
There is a huge mall, yes, I said mall, with phenomenal stores located AFTER security in the main hub of the terminal. Pittsburgh has one of the first airports to recognize that folks would like more shopping options than a bottle of water, a cup of coffee and a magazine. Another plus is NO sales tax on clothing (Pennsylvania law)!
Rental cars located on-airport, and TSA PreCheck is in place! Love, love, love!!