They briefly allowed some industry people to look at a few of the documents, like Bruce Schneier who said he wished he could have had more time instead of being placed in front of a live OS with a few dozen pdfs the Guardian wanted him to review. As for OPSEC there was the time the Guardian leaked the password to the first Wikileaks large Manning dump (the Assange hotel napkin PGP password incident), then they actually wrote Op-Ed attack pieces on Assange for "releasing unredacted classified information".
The fact that it was people like Bruce Schneier who got access to the document, and not, say, Bruce Leidl, is a big part of my problem with the process used to evaluate the documents.