It's a nice airport with just a few caveats:
No access direct access between terminals behind security so if you're switching terminals, give yourself enough time.
What happened to Terminal 1? Seriously! It's not there.
If there's ever a fire in the Terminal 4 baggage claim, it's gonna be a roast. The way the barricades are set up hardly seems conducive to evacuating.
Oh, and the baggage claim carousels spin the wrong way; I'm a firm believer they should go clockwise.