I don't eat frozen pizza, but I found an article on pizza in the Washington DC area on the Washingtonian Magazine website, and it includes the following on supermarket pizzas:
Supermarket Pizza: You Have to Be Really Hungry
We assembled a panel of twentysomething students and young professionals to taste refrigerated and frozen pizzas from local supermarkets. We avoided the house brands and tried to buy at the upper end of the price scale. Even though all our tasters eat pizza frequently—several said they survived on it during their college years—they were uniformly critical of the supermarket varieties. Even the worst delivered pizza was better.
THE BEST OF A BAD LOT
American Flatbread Cheese and Herb, Whole Foods, $8.99. Not really a pizza, because there’s no tomato sauce, but the crust is crisp and tasty.
American Flatbread Revolution, Whole Foods, $8.99. Crisp crust and a pleasing combination of good cheese and vegetables.
Red Baron Classic Pepperoni, Harris Teeter, $5.99. Good bready crust with lots of pepperoni.
FUHGEDDABOUTIT
Digiorno Four Cheese Rising Crust, Harris Teeter, $5.99. Anemic, flabby crust with a sauce that tasted mostly of sugar.
Freschetta 4-Meat, Harris Teeter, $6.79. Nice-looking, but the crust was thick and tasteless.
Freschetta 4-Cheese, Harris Teeter, $6.79. Cloyingly sweet sauce.
Gourmet Italia Artichoke, Whole Foods, $11.99. Packed two to a box, which several tasters speculated might taste better than the contents. Comments ranged from “nasty” to “disgusting.”
Gourmet Italia Margherita, Whole Foods, $11.99. A soggy crust that tasted oddly like fish.
Kirkland Cheese, Costco, $7.99. One taster compared it to “Kraft Singles on cardboard.”
Milena’s Take N Bake Sausage, Safeway, $7.99. Spongy, lifeless crust with bland sauce and flavorless sausage.
Red Baron Pizzeria-style Four Cheese, Harris Teeter, $5.99. Greasy and bland with a bagel-like crust.
Not a pretty story. My thing is, if you're going to eat something that isn't particularly good for you (and who among us doesn't, from time to time?) then it should at least taste good. The entire article can be found at
http://www.washingtonian.com/dining/archive/03/pizza.html