Phoenix Sky Harbor is incredibly well laid out like Phoenix itself. It makes sense with a grid structure.
I've flown out of Terminal 2 and 4 and both are well equipped with lots of eating options and things to occupy you before your flight. Check in proved painless and security were even friendly!
Buses to the rental car centre were plentiful and the drivers very obliging.
Only downside is that it's huge and you'll wear out a lot of shoe leather!