It's not pizza without marinara sauce, IMO.
I built a brick over in the back yard and that sucker gets up to 1200 degrees. It will cook a pizza in one minute. So oftentimes I'll make a bunch of dough balls and have a make your own pizza party. I'll put out the sauce and different toppings and you put what want on it.
The only one I've ever seen put ranch on a pizza instead of marinara is my next door neighbor. He came over with a bottle of ranch dressing and put that on his pizza. He said that tomato sauce gives him heartburn, so he uses ranch.