Matt Cain is a dramatic example of how improving the defense behind a pitcher can make him look incredible. Based on the stuff tha the can control (BB, K, HR), Cain is essentially the same pitcher he's been the last two seasons. However, he has the third best Defensive Efficiency Rating in the NL, meaning his teammates are helping him out a whole lot. He has an outside shot at winning the Cy Young Award this season. If he does, he owes his teammates a great deal of gratitude.
Aaron Harang, on the other hand, not so much. His teammates have scored 2, 1, 3, and 1 runs in his last 4 starts while Harang is in the game. He clearly hasn't been a dominant pitcher, but he can't be happy with how little his teammates seem to have his back. And don't get me started with Dusty Baker. The last two starts, Baker has unnecessarily brought Harang out to pitch the 8th inning only to see Harang give up runs. Dusty has done a decent job of managing the starting rotation this year, but for some reason he continues to abuse Harang. Hopefully he's starting to learn when to say when with Harang.
I think it would be pretty cool if the Reds took two of three from the Giants, especially if they can manage to win games started by Tim Lincecum and Cain. It won't mean much for the long term of the team, but we're just looking for small victories at this point. That's all we've got anyway.