well..., there could be added salt/sugar/msg in the sauce, three very powerfull flavour enhancers ive had pizzas with 5+ toppings taste like nothing, which is mainly attributed to flavourless veggies and bland meats without any kind of added sauce or marinade in my caloric-defense, i only order pizza without cheese or pepperoni, 2 of the worst things you can ever put on a pizza, unless you like greasy dough soup