I've never heard of Pizza Pizza, Pizza 73, Panago, or Boston Pizza, so I really can't comment on them.
Papa Johns is the best out of the list, with Pizza Hut a close second.
Little Ceasars is a "get what you pay for" kind of place. Cheap price, but cheap quality.
Domino's is seriously a joke. They have spent all that money on advertising that their pizza is no longer shit, and yet, a few added spices do not change the fact that the quality is horrible. Essentially you're paying more money than you would at Little Ceasars, but for the exact same pizza.
Personally, I like Donato's, Larosa's, and Adriaticcos. I realize that the majority of you are not going to recognize these places as they are not nationwide or worldside chains, but seriously try any of those places pizzas, and then try the pizzas from the places I commented on. Tell me they don't taste like ass.
More to the point, I'd like to mention that I have actually traveled to Italy, and had "real" pizza. No restuarant chain can beat out the original, but if you are holding Domino's, Papa John's, Little Ceasar's or Pizza Hut as standards for great pizza. . . you really need to expand your food horizons.
On an interesting side note, I recently discussed pizza places with a few people. Incredibly, the people who enjoyed Little Ceasars and Domino's also thought that McDonalds had awesome burgers, and that Taco Bell was great mexican food. Based on the economic status of the people that made these comments, I formed the following theory:
Only poor people who can not afford the price of good food, have standards low enough to include fast food joints as "great" places to eat. Maybe it is because that is all they were able to afford, and their taste in food adjusted to the diet. The truly sad part is, that when these people are exposed to better quality food, they reject it because they are used to the poor quality. I say this, recognizing that I am by no means wealthy, and that people who are better off financially than myself, would probably find my taste's in food as disturbing as I find the tastes of people who struggle more than I do financially.