Phoenix Sky Harbor International Airport: The portrait of inefficiency.
Phoenix is a legit city. It's bustling and friendly and there's no shortage of reasons to come visit, in fact I can only think of one thing that would keep me away and that's having to snail walk through security check-points with not nearly enough security personnel and an incredibly outdated system.
I've never been in a slower line anywhere. Their machine takes forever to reset in between people, the security agents bicker with each other or general airport rules, and they have no idea how efficiently use their staff and equipment for the betterment of everyone's experience and manner.
Beyond the total failure to be able to process what was actually a pretty short line of people through to their gates, the food and beverage options are abysmal at best.