I think we should actually review a speaker we do not like. I mean review them sensibly in the same manner we review speakers we like. This will give buyers more perspective of both the speaker we like and not like. Also get to learn more about the preference of that reviewer consequently. The more info the better.
Although I agree such knowledge of reviewer preference would be useful for wise and knowledgeable readers it would be a foolish and dangerous game for the industry.
Besides we can never know for sure if we dislike a particular component because of its performance or because we were not able to assemble a system in a room that makes it perform to its designer full objectives.
You refer to "sensibly reviewing" - IMHO such thing is not possible if we dislike the component, the designer or even the quality of manufacture. Reviewers are humans and the high-end is an extremely subjective hobby, filled with biases. Except for those exposing evident objective failures I do not remember of any negative review I can consider fair and of use.