whatever restriction is put in place it should allow for the individual to change his/her opinion with circumstance and his/her recent experience, as they see fit. Or to reaffirm his/her previous positive opinion from continued satisfaction with a particular broker.
The reviews section is an area that is difficult to moderate because we would have to test each product on a regular basis to determine who's reviews were bogus and which were accurate. I also hear your issue with members posting multiple reviews for the same company. We are looking into how we can limit the number of reviews a member provides.