PZA has really good pizza (and not just really good pizza 'for an airport') but actually great crisp crust, flavorful mozzarella, and fresh-out-of-the-stone-oven taste! I grabbed a pepperoni slice on my first layover there (the guy could have left it to warm a BIT longer in the oven) but it was still delicious and crisp. I was passing through again on my way home and it was 9am and this was by far the most delicious breakfast pizza I've ever had! Grab the AM Pizzeta (personal sized pizza only available before lunch and, in my opinion, better than the by-the-slice option). The AM Pizzeta has spinach, loads of crunchy bacon, mozzarella, and an EGG on it - seriously delicious. So yeah, I am a fan.
Also, I walk the entire airport when I have long layovers (and to get my steps in) so I saw what else the terminals have to offer and PZA in Terminal E is, by far, the BEST option.