I ate at Guiffrida's a couple weeks ago, I had not been there for years. I thought the pizza was pretty bad. Not only was it burnt, it tasted almost like a frozen pizza, very dry. They seemed to be busy and I didn't see anyone else with a pizza. Maybe their other food is good.
I tried Roberto's pizza the other day. Still didn't care for it as much as Rusticanna. The sauce and crust just wern't as good. Rusticanna's can be a little greasy and at times not have much sauce but I still think its better than Roberto's. The place was pretty packed so aparently people do like it, or some of their other food is good.