Iowa Machine Shed. I thought the one in Davenport was the one and only for a while.
Don't knock Pizza Hut pizza until you've had Paul Revere's. They were a chain back in the day - don't know if any of them are still around. Last one I knew about was in Mt. Pleasant, I think. Probably the worst excuse for a chain pizza ever.
I was in the same category as well. Not only is Machine Shed a chain, it's a chain among chains, as the parent company also owns Johnny's Italian Steakhouse, Thunder Bay Grille, and a restaurant at the Iowa 80 truck stop called Gramma's Kitchen.
http://www.heartofamericagroup.com/portfolio/restaurants/the-machine-shed-restaurant/
And I had no clue until 5 minutes ago that Pizza Pit was a chain.
As far as Paul Revere's Pizza, at least the one in Eldridge is now known as Nickelberry's. Paul Revere's Pizza was actually really good for the price point (less expensive than Pizza Hut and tasted better). When Nickelberry's took over, well, that was some bad pizza.