Wow, what a complete waste of time to put together that useless info.
It's simple....people should rank worlds they play in or have played in...period. This list is completely useless. It's based on what? Your expertise on all the worlds, most of which you have never played in? To tell me that the world I play in is ranked 45th, 90th, 213th or whatever is just absurd.
And before you whine, grow some thick skin, because when you put info like that out there, folks are going to have various opinions on it, for better or for worse.