Well, I agree that it's hard to evaluate how a bullpen gets their wins without watching all of their games. However, I HAVE watched about 99% of the Giants' games this year so in this respect my opinion comes from a position of authority.
But again, there is another way to make this determination without watching every game. You look at winning PERCENTAGE. Because a bullpen that frequently blows leads, only to have their team regain the lead the very next inning, is the sign of a bad bullpen, period. If you are giving up runs on a frequent enough basis that you are the beneficiary of a lot of vulture wins, chances are you'll have a high loss total as well, because even the best offensive teams are not going to be able to overcome a deficit or break a tie on a very regular basis when they face the other teams' best relievers.
After all, in a tie game or with a lead that they just gained the previous half inning, a team is pretty much always going to be putting out their best available pitcher at that point, unless it's the 7th or 8th inning and the closer isn't needed yet. Even great offensive teams aren't going to overcome those odds so many times that their relievers will have a great winning PERCENTAGE. They might end up with a lot of wins, but invariably they will end up with a lot of losses as well. AND their ERA is going to be high. A reliever with a low ERA and a lot of wins is the sign of a reliever who has held a tie score in late innings, NOT the sign of a pitcher who is the beneficiary of a great offense.
The comment about "don't want to admit it" was simply me trying to push your buttons. This thread gets boring quick without some good old-fashioned, knock-down, drag-out arguments about baseball! Don't take anything I say too personally here. Even Rajraj knows that as much as I harangue him about his opinions it's just our way of livening this thread up a little bit. I always respect the opinion of a guy who is willing to argue about baseball out of passion for the game or their team, even if I won't directly admit it.