The worst pizza I ever had was from Dominos when I was in high school. I don't blame Dominos though, it's the school that fucked up.
I went to a private school, but the high school building had just finished being built, and so the school didn't have the permits required to make their own food.
So they bought pizza every day.
But they bought it at 9 in the morning, for delivery asap. Once it arrived it sat on a countertop for a few hours.
At around 11 they would start microwave re-heating the pizza, then stick it in the oven to stay warm until people ordered it.
And sometimes they'd do the re-heat process with day old pizza.
Oh god it was horrible.