Rivera has only surrendered two home runs, while facing 527 batters across 16 different postseasons. It's been 13 years and 309 batters since he last allowed a postseason home run to Jay Payton in the 2000 World Series. Mariano is the only player in any sport in recent memory that will retire as the unquestioned greatest player of all time at his position — if that doesn't scream overrated I don't know what does.
Rivera debuted as an unimpressive starting pitcher in 1995, but the next 18 years seem to have gone by so quickly and now he's gone. He'll never throw another pitch in the home pinstripes again. As a fan you want to see Rivera pitch forever even though you know that's not possible. He might not have been the most important player of the "Core Four" dynasty, but he was certainly the most valuable. The last four championships ended with Rivera getting the final out. In the 2009 playoffs — the last of the five championships — Rivera was the only closer to not blow a save.
Goodbyes are never easy, but Mariano Rivera did it the only way he knows how — with pure class.