I love Phoenix, and the airport isn't bad, but...
There is a lot of walking between terminals. There are moving sidewalks, but it still seems like a trek.
My biggest complaint is restaurants. We wanted to try and get a sit down meal in Terminal B and no dice. The one food area had two food choices (mexican and pizza) with the smallest dining area I ever saw. It was a mad battle for table space if you wanted to eat. Not ideal.
I can see there are some restaurants in the works, so maybe things will get better.
Even seating the terminal area was pretty limited.