I haven't bought a chain store pizza (Pizza Hut, Papa John's, Dominos, Marcos, and god help us all, Little Caesar's) in a long, long time. Just about any corner bar or italian place that serves a pizza is 10x better than what you get out of the chains...
Never cared for Pizza Hut's pizzas. Too oily for me.
Parents used to take me to the Little Caesar's pizzeria at Reynolds/Heatherdowns back in the day. I remember the pizza being somewhat good back in the 80's, but now it's cheap trashy food at its best (worst?). The cheese is melted but it never tastes cooked if that makes any sense...
Haven't retried Dominos since they've "revamped" their ingredients and crust a year or two ago. Eh...probably won't.
At work, I think my boss is sleeping with Papa John, since most of the time that's all we have for any sort of special group gathering/meeting.
If I had to pick a chain, I'd still go with Marco's...