Power rankings back in the day would set an idea of how lines were made. It just gave you a basis. A lot of great cappers still are old school and use it. It was prominent back in the day when the Stardust was around. People would talk about their power rankings. Its a whole different ballgame now, the game has changed.
Im not knocking power rankings, but it just doesnt have the value it once did before the internet age but its always a good reference to use.