Little Caesars is not bad if it's fresh out of the oven. But it's definitely not my favorite pizza. The problem with the $5 pizzas is that they skimp on everything. I worked at a LC for 3 years back in the mid to late 90's and that's when they started the hot and ready concept, although when we did it, it was only one night per week and it was $2.99 mediums. But we used less cheese and less pepperoni than a normal medium. Pizza is pretty cheap in terms of cost to the store, but they aren't making a lot of money on a $2.99 medium or $5 large. It's just another case of making less profit per item, but selling more items.
I used to hate Domino's, but they changed their pizza not too long ago and the new stuff is a lot better. Still not my fave, but pretty decent for cheap pizza.
Papa Murphy's is good. I used to stop by there at least one night a week on my way home from work when we lived in Oregon. We don't have any stores in the Charlotte, NC area, so haven't had it in a few years. I just looked it up and there are some stores in NC, but the closest one is about 100 miles away in Greensboro.