If you have a security clearance, it's possibly unwise to download/have this information on your own, especially if you have had secret access to it, mainly because there is going to be a bunch of counterintelligence to figure out how things were leaked (presumably PFC Manning, but who knows?). It would complicate things during an investigation if you had information on your hard drive, even if you could document that it had come from an outside commercial source. With some information, even if it is "known" by the public, having access to it through classified channels is a way to vet the information, so if someone posted "super secret a" to a website, and you commented "oh, yes, I've heard of that", you would actually be corroborating information and leaking classified information.
FWIW, nothing in these seems to be particularly damning of the US. It is basically "war is hell", "mistakes are made", "we like to put a spin on things". It's pretty much par for the course for special operations forces to do things and then have the positive outcomes attributed to indigenous forces, and the negative outcomes hushed up.
There probably would be some net benefit to prompt declassification and publishing of much of this information. I don't condone illegal leaks, but there is definitely a public interest in having the public informed about what is going on. Aside from the reporting on TF 373, nothing in the NY Times or Guardian analysis of the documents (I haven't looked at the raw documents) is a big deal. As far as I can tell, nothing particularly sensitive about 373 was published, either.