Sbarro is nasty fuckin' rotted cat ass. :X
When a Cleveland pizzaria can make a better imitation New York style pizza than your chain; you know you're screwed.
With that out of the way. . .
It seems to depend on your geography. New York has the kick ass monster pizzas, and Chicago has the wading boot deep dish pizzas. Being in Cleveland, it's mostly shit.
Arcade Pizza is my favorite local place. Greasy as hell, but if you're eating pizza - you're already at a disadvantage.
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Another good thing is it isn't grease sponge pan pizza crust. So while it's greasy, it isn't nasty going down the throat like a pan pizza.
When I'm rolling in the dough, I like to hit Papa Johns. By far my favorite chain.
When I've got lots of friends over, Pizza Pan is a kick ass local place. The deal is when you pick up your order, you get two free pizzas of equal or lesser value with your order. The offset is the pies are a bit smaller, their large is slightly smaller than a Pizza Hut large; and the prices are a bit higher; but for $18 you can get three three topping large pizzas. It's good party / social feeding.