Disclaimer: I haven't even started to pour through these. That said:
There can be a lot of debate over certain leaks--a good example is the video of an attack helicopter mistakenly gunning down a group of civilians in Iraq. Whether that's good for the country or morally sanctioned is a bit of a back-and-forth game.
I don't think the Afghanistan Logs (or at least some portion of them) fall into such a gray area. The biggest issue: Anti-Taliban informants have been compromised. The Taliban has begun hunting them down.
This is going to seriously discourage future cooperation in any areas that aren't under full Afghan government control. It's a major setback for the war that we're already losing.