Eating pizza with silverware basically ruins the experience of eating it. :< It's not like it's fun to eat pizza with your hands, but it just takes away from the experience if you don't. The only time it's really okay to use silverware is if the pizza toppings are too heavy for the crust, or if it's exceptionally hot.
And cutting it up and then eating it with your hands is only acceptable if you're a toddler.