A very clean airport and easy to maneuver around. Decent food choices while in passenger terminals and a few Arizona shops which actually has good pricing for gift items.
The rental car counter is away from the airport but plenty of free rental car buses to take you directly there. When you return your car, if you rent, you may check in your baggage to be taken directly to the airport (on select airlines).
I am very impressed with Phoenix airport. You will be too.