In order to see just how effective Kimbrel was this year, here is a chart comparing his 2011 WPA with that of the average of the 130 most-used relievers.

If green is good, then that is a whole lot of good that Kimbrel was in 2011, and he was much more effective than the vast majority of the league
finished 2011 with 46 saves and 127 strikeouts. In 77 innings, that translates to a mind-boggling 14.84 strikeouts/9 innings. Amazingly, that ratio is second only to LA's Kenley Jansen in all of MLB, but his 127 strikeouts led all relievers. His 46 saves tied for the most in the NL.
1.52 FIP #1 in MLB as was his 1.94 xFIP and his 3.2 fWAR. Kimbrel wasn’t just an impressive rookie closer, he was the best reliever in baseball.