Recently we've had some discussions around the delivery of critiques. Please note that it is not appropriate to deliver a critique that is aggressive towards another writer on the forum, even if the content of that critique is delivered in good faith (which our current guidelines do NOT do a good job of acknowledging--more on that in a moment).
It is also worth keeping in mind that, due to the nature of the forum, we are constantly working with people we don't know very well, or at all, and newcomers to the group may have a great deal of experience writing and critiquing (or being critiqued) or none at all. A critique that I give to someone in this group is going to look very different than a critique that I deliver to someone that I know very well, and/or whom I've worked extensively with as a writer.
Obviously, honesty is crucial to effective critique, and there is nothing even necessarily wrong with being blunt. That said, even a negative critique shouldn't be mocking or aggressively phrased, no matter how strongly the critiquer feels about whatever it is that they're critiquing. You can express concern, distaste, disagreement, or dislike without being rude to the person on the other end. We're all writers here; we're all up to the task.
As I mentioned above, our current guidelines in the "Welcome to RE" thread really do not do an adequate job of outlining how we as forum members should give and receive critiques. They have been overdue for a revamp for quite some time. That being said, this seems like a good time to open the floor to a discussion of what people would like to see addressed in a new set of guidelines.