Definitely not on my list of favorite airports.
Ease and efficiency are good. It's definitely one of the older ones that need major renovations, but you're pretty much in and out. Unless you're on one of the delays. And if you take the monorail to the wrong place, you're damn out of luck walking. This place is huge. Don't even try ending up in Baggage Claim in Terminal 1 if all your baggage is at T3. You will need to find yourself the shuttle, which in turn, takes days to get to the other terminal.
Other than that, everything is clearly marked. TSA moves quick. Taxis are easy to find, baggage is accessible, and they got a hearty selection of slots.