There are some of you out there who disagree with the deep dish being classified as a Pizza. And that's fine.
Pizza is a pretty sacred dish so to each his own.
That said, there really wasn't any way to eat THIS pizza without a knife and fork. I refuse to get grease and tomato sauce all over my fingers. Especially if I'm in a suit. So for those of you who enjoy a NY slice for being something you can eat on the go and then quickly wipe the flour from your hands on a single napkin, I salute you.
But rather than getting all tangled up with definition or classification... if it's good, it's good.