Well, I just think its cuz we're all a bunch of jerks! No, seriously, I think it's cuz we try to help make them improve their levels. It's nice if you KINDLY say that the level sucks (i.e. "Hello good sir, do you know that your level sucks?") GWhahaha! Just Kidding of course! I think... But just tone down the reviews from "YOU SUCK!" to nice suggestions on how to make the levels better.