Ate here a few weeks ago. I had a burrata salad, which was mediocre, and some cheese pizza, which I found perfectly adequate. I’m no expert on square-cut pizza, though, so I’m not well-suited to comment on its quality.
For a while after it opened, Old Bus was a proper food destination. Not sure I’d recommend coming to Cellarmaker just for the pizza, but it makes a fine accompaniment to the great beer.