Reds pen has a good ERA this year, but if you look across the numbers there is room for much improvement. ERA just doesn't mean that much for a pen.
For example, the WHIP is 1.41, which is one of the worst in the league. BA against is high. OPS against is 13th in the league, on the negative side.
I don't know why the ERA is good, maybe because of the way Dusty uses them, maybe just the luck of the draw. The only two relievers with particularly good WHIP numbers are Massett (small sample) and Lincoln (but he's allowed 10 homers in 69 innings to counteract the good WHIP). Affeldt and Cordero have reasonable WHIPs (under 1.4) but most of the others don't. Bray has a good ERA (2.82), a high WHIP (1.61), and has walked 24 in 44 innings. Burton's numbers appear to have fallen off after the injury.
My conclusion is that the bullpen hasn't been as good as the ERA suggests and that it still needs work. Cordero and Burton are keepers. Affeldt a free agent. Bray is still young and can be very effective in spots. How to handle for next year?