Philly has beaten a lot of dregs: The Wizards 3 times, the Kings, Raptors, Pistons, Suns, Hornets and Warriors. They also have beaten the Hawks, Pacers and Bucks, who are not horrible. Also, the Celts lost to Phoenix and the Hornets.
They have lost to the Heat, Nuggets, Knicks, Jazz and Blazers.
As for the Atlantic being the strongest division by the end of the year, I don't get it. New Jersey and Toronto will continue to be horrible, and the best team are not going to be that great.