I have flown in and out of ATL many, many times. Love the way it is set up. Very easy to get around in.
If there's a better airport to connect through anywhere I've yet to see it.
Easy movement between terminals and a terminal change is not a deal-breaker on a tight connection as it would be at many other airports.
Plenty of drinking/dining options in every terminal if you have a longish layover as well.
Love flying through ATL, hate many of the alternatives.