Just like in the breathing community, when you insult someone or someone's practices it comes back to you. You don't want to be pegged as being the local on-line bully. If you are asked to give your honest opinion on something and your response is negative please do it through private e-mail. Also, be sure to include legitimate reasons why you feel that way. Tell why you don't like it, or what you would change.
Positive feedback is very important.
The on-line community relies heavily on interpretation of your words since they can't see your body language or hear your tone of voice. Insert genuine feeling into your messages. Whether or not the reader is part of your downline you'll want them to be educated. Education is the key no matter what part of life we're dealing with. It's very hard to get anywhere if you don't have the information.