I have two separate issues with meatballs on pizza. One is that they're often sliced. The fun of a meatball is that it's, you know, A BALL. Once you slice it, it becomes SLICED MEAT TOPPING. And SLICED MEAT TOPPING sounds like something on the menu of a second-rate pizza chain.
'meatballs' on Serious Eats
Like many of Artichoke's pies, the meatball slice is big, cheesy, salty, and greasy, but not in a bad way. If oily, rich, and filling while being plenty flavorful is what you're looking for, it'll do you just fine.