Used Phoenix Sky Harbor airport many, many times over the years and have never had a major issue.
This airport is massive in size!! Luckily they have moving floors to expedite the process and they also have people driving small vehicles that work on tips only. Don't think that because you are connecting planes your gates will be close. It is worth paying a dollar or two tip to get the ride especially when you are in a hurry.
This airport has more than one Starbucks location. The Southwest terminal has a Starbucks right after security so depending on where you are flying out of it is possible to get your coffee fix after going through TSA.
And free wifi!! Sort of. It doesn't work very well in certain parts of the airport. There will be times when it appears though it has connected but it doesn't work. At least you know you have the option if luck be on your side.