I just recently returned from a trip through the Phoenix airport and while there is still a great deal of construction in Terminal 3, you can see how great it will be once it is done.
Compared to other busy airports across the country, this airport is right on par with others. The airport is being enhanced to provide a better experience for the travelers. You can see parts of the airport which have been completed and seating is sleek and comfortable, artwork is beautiful, and the airport is extremely clean. They have added family restrooms too which is always nice when traveling with small children.
One downside currently is the food choices. Since there is so much construction in Terminal 3, food choices are limited. There are mobile carts set up once you cross through security. There are also some older establishments once you get closer to your gate.