Found some numbers. Career Save Percentage, only contemporaries:
Aroldis Chapman 90%
Trevor Hoffman 89%
Mariano Rivera 89%
Joe Nathan 89%
Billy Wagner 86%
Francisco Rodriguez 85%
Lee Smith 82%
John Franco 81%
And I like the stat "when leading by one run after 8th inning", odds of winning are 85%. 2 runs 93%. 3 runs 95%.
So you are going to win 4 out of 100 times more than the average when Rivera comes in to start the 9th with a 1 run lead.
Rivera's avg. games per season was 67. That translates out to Rivera being worth 2.7 additional wins per season over the league average.
Every win is gold in the world of MLB, especially in a pennant race. His 89% Saves is really good, but not necessarily super head and shoulders above other top relievers.
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