I've been wanting to try their deep dish after seeing a review on Hungry Girl's page, but haven't yet.
We did order a NY style before, which I thought was very "average," like something you'd get from Costco or an amusement park food stand, or any place that does not specialize in pizza. Specifically, the sauce was very, very bland. No spice at all. As Tempo mentioned, it tasted straight from a can. Not that this is bad; when I made pizza at the concession stand in college, we would mix canned tomato paste with tomato sauce and spice it with garlic, basil, oregano, etc., but I believe Big Man just used pure tomato paste and nothing else. The cheese was also clumpy and had water on top, instead of hot and stringy. The toppings were unevenly distributed; you'd have slices with a good mix and others with all onions and nothing else. A little bit more love and care could have been put into making the pizza. The good thing though, is that it was very reasonably priced; I don't feel cheated in any way, but got exactly what I paid for. However, this leaves little room for finding any value, so I doubt I'd go back, as I already have my favorite spots for both NY and Chicago style pizzas elswhere.