Just plain gross.
I've eaten at two Pizzera Uno locations and both were just awful. The service is alright, but the food is some of the most terrible I've ever had in a restaurant. Once I had an undercooked pizza (you'd think they'd get the pizza right at least) and another time I had bland flatbread pizza that was too overpriced for what I received. Avoid if you can, unless you're starving, there much better pizza to be found in Boston.