The original idea of Wikileaks was for whistleblowers to submit their scoops to them. Without the brand, there are no leaks, as whistleblowers don't know how to contact in the first place. Sure, the leak might get out, but Wikileaks provided a well known, secure platform.
These cables also came from somewhere and someone, and they approached Wikileaks with their information. Without Wikileaks, this wouldn't have happened.
I would agree that Wikileaks and Assange inject their bias a little heavier than what I feel appropriate as the leaks really do speak for themselves. They didn't need to call the video Collateral Murder, etc.
Assange has done more good than bad when handling this, and there are really two stories going on. The first being Assange and Wikileaks, the second the actual leaked information. Yes, they're tied together closely but the cables themselves can be read and examined without Wikileaks in mind.