Guide for Submission Review said:
Try to find something positive to say, provide encouragement. If the submission has flaws, they surely should be mentioned-but try to start off with something positive about the submission. It brings validity to the points you will make later. If there are flaws, and you point them out-try to encourage the person to go back to the drawing board-rather than leaving them feeling rejected. Don't be insulting, providing nonconstructive critique; it makes the person submitting the creation feel bad and takes away from the validity of your suggestions.
Identify any problems, if any, in a respectful manner. Give specifics, identify what areas of the submission require improvement, expansion or other type of edit. Don't point out flaws without offering some kind of suggestion of how the person can either fix the flaw, or rework the submission to make it fit more into the setting. If you're willing to critique something, be prepared to step up and help the creator of the submission.
As Wes has pointed out: “We are all in this together.” We are a community, and its up to us as members of this community to build it and each other up by turning the tech forum from a place to have something torn apart, to a place where we help each other build and create things for the setting we can improve the community as a whole.