I too think that this is a good idea, but with its complications.
Perhaps another idea would be to do product reviews. This would be very helpful to many of the newer hobbyists as well as some of the seasoned veterans. Start a closed thread, or a thread that can only be "rated" which would be rating the product itself, not the thread. If desired, add the option to put in a comment, but put a character limit to avoid lengthy "second reviews" Also, avoid doing a review of very common items such as heaters, powerheads, overflows, etc. and keep it to items such as lighting ballsts/bulbs, ca reactors, wavemakers, probes/monitors, etc. etc.
I dont know, just a thought.
Another idea is to do this through submission. The reviews could be submitted by users to a mod who will review the article. just another idea.