Ick! The TL;DR of this review is simple: Go to MOD Pizza in Fitchburg if you're looking to build your own 'za.
I ordered the Buffalo Chicken pizza. They use a buffalo sauce on this pizza that tastes neither buffalo-flavored nor delicious. 'Chemical-y' is how I'd describe it. The pizzas are overcooked so parts of the crust come out burnt. The chicken on the pizza had two sketchy, fatty pieces. Think about that--on a 10" personal pizzza at least two 'Oh my god, what IS that?!' pieces of chicken. I picked the rest off. One of them looked really dark and sketchy beyond the two I'd already eaten.
The bathrooms are locked because it's State Street. I thought that was excessive but twice while we were eating people came in to ask to just use the bathroom. It's spacious enough inside with a cool, huge dining room-like table to eat at in the middle of the room. But what's cool decorations when the food isn't enjoyable?