Assange explains his reasoning behind the "spin" they put on material here: http://www.youtube.com/watch?v=wBENlJfZ-f8

I'm not sure how I feel about it. On the one hand, I happen to think what Wikileaks is doing is important, and calling something "Collateral Murder" makes people pay attention to them. On the other, I wonder if there isn't anything else we can do to make people unwilling to read source documents do something other than herd themselves to and from each talking head who gets their attention. Is it sane, or even possible, to leak things in manner that contains no bias, and to choose what to actually leak with no bias, without becoming mostly useless noise? I honestly don't know.

But, Wikileaks does always release the full, unedited source of what they're leaking. If nothing else, it's a step above mainstream Western journalism.