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yes users can give opinions on sites, whether good or bad.
constructive criticism is always welcomed by many.
it is upto the users to decide whether to use a website or not, but they should not base their decision just on reviews alone.. some opinions could be biased.
the only time i would be wary about visiting a site is if someone reported that it has a lack of security or moral obligation.. ie. the site is used for phishing, it has hidden scripts that try to collect data, they don't adhere to privacy laws or data protection act.
but overall, the users have to protect themselves. all we can do is advise them as best we can with the information we have. butr we are not responsible for users opinions unless they are known to be innacurate, in which case the innacuracies should be highlighted.