the last time we came through Hotlanta mobile passport was not working... huge lines - very few agents - many, many, many were missing flights - we made ours but I ALWAYS do a minimum of four hour layover (this time it was five - six other folks in tow, one of whom was my 85 year old mom who is very spry for her age, but still 85) - we waited for bags for about 20 mins - over an hour in the customs line (hubby and I have GE, but no one else did so we stayed together) - breezed through security as half of us had TSA pre-check so they let us all stay together.

Miami is worse by far - Charlotte is the easiest we use... but I hear it is getting worse these days too