I don't know what it is -- but Metro Pizza is inconsistent. I ate at the Henderson location recently, and it was almost inedible. Because the pizza was underdone, the crust was doughy and the toppings were a little raw.
Just two weeks prior, I went to the location on Tropicana. The same Gotham pizza was so much better. Maybe the ovens are different, or perhaps the Tropicana location cooked it longer.
Service is always average at these restaurants. Prices are a little high for pizza- but can be worth it at times. Bottom line, I would give this restaurant 3 stars for its inconsistency among locations.
Drive past the Henderson location -- and go to the one on Tropicana. You won't regret it......