Why do people always say the save stat is over rated?

Take into consideration what goes on in those situations. A closer has to come in with one inning left to shut down the opponent. They're nervous as hell especially with a one run lead in an away ball park. I don't believe getting a save is as easy as some of you say. Fine, maybe with a three run lead it isn't so hard, but with a run one lead and the game possibly on the line you can't say it is easy. If it was easy, there would be tons more of GREAT closers. When I think of all the great closers, I think of Mariano Rivera, a younger Trevor Hoffman, and Dennis Eckersley. Robb Nen was good and so were a few other closers, but there aren't any other brilliant closers. If it were easy to do there would be more greats. What do you think?