"The people who love calling it a 'World of Hats' are doing the same disservice as the people calling Jace a 'Mary Sue'." Just because you casually dismiss it doesn't make you right, it just means you're in denial. Would randomly smashing two worlds together make them great? Of course not, nice straw man. Would Innistrad work as a secluded part of larger world? Yes, until you introduced cosmic horrors. And Jace IS a Mary Sue. Maybe not the most egregious example, but he's still a contender.