Method Man -- Hey Marcus Mariota ... Don't Be a Manziel!

Johnny Manziel has become a cautionary tale ... at least according to rap legend Method Man ... who says he hopes Heisman Trophy winner Marcus Mariota won't make the same mistake JM did.

The Wu-Tang Clan co-founder is a huge football fan -- especially when it comes to the Jets -- so we had to ask how he felt about all the crazy moves in the NFL this week.