Grimaldi's is really good pizza. It does remind me of many of the pies I had in NYC (reminds me of Arturo's a little bit) and I think their topping selection is awesome. It's a crispy crust with just the right amount of chewiness and flavor. Sauce has a nice flavor but I think it's a little nervy to charge extra for more sauce. I've never had a pie from there that was greasy.
The DC Ranch location is beautiful, what a great place to sit outside with a delicious pizza and a cold beer.