Nick, nobody is telling you not to speak your mind, you can do honest constructive criticism as other people do here (including myself, I have always spoken my mind here). But thats not the issue, its the "campaingning", the repetition over and over of the same thing even coming out of contex, the sarcasm, exagerations and all the demagoguery that has no reason except for something other than simply trying to express an opinion.
If you just stick to being objective and constructive, no one will mind any negative comments.