Like all the stuff I've had from Matt Porco's restaurants, I was really pleased with what I had tonight during my first visit to Mezzo.
Highlights: nice ambiance with high ceilings with that classy/ rustic Italian thing going on (and a big wall o' wine), nice wine-by-the glass selection in either 3- or 6-oz pours, and an appealing menu. Aside from the wood-fired pizzas, there is a build-your-own cheese and meat charcuterie platter, several delicious-looking pastas, nice salads, and a few more traditional meat-based entrees.
My dinner date and I started with salads and split a pizza. I had the escarole salad and he had the kale, and they were both delicious. Mine had very tasty marinated tomatoes and a rich, creamy (but not too heavy) dressing. We had the wood-fired vegetable pizza, which was more Neapolitan-style. The sofrito/ tomato sauce was rich and tasty. Light on the cheese, like a lot of thinner pizzas. We tried a few different reds and they seemed like great, mostly Italian selections (the barbera was my fave). We were also totally drooling over all the pasta dishes that were passing us by, so I might try one of those next time (which they also offer in half-portions; a nice touch).
Overall, I think these owners have a good thing going with Italian food, and Mezzo is by far my favorite level of Sienna Mercato.