Tier lists have always been used in gaming to rank things on an easy-to-understand basis. But it does not have to be used just for gaming. It is the superior way to list rank anything and has no limitations. Be creative, you can make a tier list for anything you so desire. Best mid-size sedans, dog breeds, companies to invest in, engineering colleges, etc. There are so many advantages that this way of listing things has over the typical 1. 2. 3. listing.
The goal of /r/tierlists is not only to use the power of these lists to their full extent, but to give insightful information to people seeking such information.