And I have the numbers to back it up!
For one thing, they have the best bullpen ERA in all of baseball at 3.10. But even beyond that, they're just so effective because they don't walk batters and they strike a lot of guys out. And that's generally a pretty good formula. Here it is broken down, with the MLB rank in parenthesis:
ERA - 3.10 (1)
WHIP - 1.23 (1)
K/BB - 3.38 (1)
K/9 - 8.34 (3)
HR - 25 (1)
OBP Against - .304 (2)
SLG Against - .361 (2)
OPS Against - .665 (1)
Not bad. Looking at them individually almost makes things more impressive.
Joe Nathan - 51.0 IP, 1.59 ERA, 0.82 WHIP, 72/10 K/BB, 12.71 K/9
Juan Rincon - 56.2 IP, 2.22 ERA, 1.20 WHIP, 50/17 K/BB, 7.94 K/BB
Denys Reyes - 34.1 IP, 1.05 ERA, 0.90 WHIP, 33/7 K/BB, 8.65 K/9
Pat Neshek - 20.0 IP, 0.90 ERA, 0.45 WHIP, 30/3 K/BB, 13.50 K/9
Jesse Crain - 58.2 IP, 4.45 ERA, 1.38 WHIP, 47/15 K/BB, 7.21 K/9
Matt Guerrier - 40.1 IP, 3.12 ERA, 1.61 WHIP, 23/16 K/BB, 5.13 K/9
And when you consider that Willie Eyre and his 6.48 ERA is not pitching any more high-leverage inning, and the fact that Crain had an awful start to the year but has been very effective in the past couple of months, the 3.10 ERA doesn't even do justice to how good this bullpen is right now.
Take a look at Pat Neshek's numbers. Hardly anyone knows about this guy, but in 20 IP he has struck out 30 guys, walked 3, and allowed just 6 hits. 2 of those were solo HR, and that's the only runs he's allowed this year. If I was playing a video game, I'd be hard-pressed to replicate these numbers. And he's 25 and in his first year of service. Not bad.