4 Stars for terminals 3 and 4, 1 star for terminal 2.
One would think that United Airlines would tell Sky Harbor to update terminal 2 so their passengers don't feel like sardines packed into those tiny gates while waiting for their flight. What a disaster!
I believe it was Thomas Friedman who said... "Asia's new airports look like they belong in The Jetsons while Sky Harbor Airport looks like it belongs in the Flintstones".