gigglewitch.
Uk campsite DO use negative reviews sometimes so long as they are worded right.
a friend has one on there (and that site has rather a lot) and i have read a fair few less than complementary reviews myself.
i think the key is when being negative you have to be very factual.
A review that says "Had a an awful weekend here, the owners were rude, the toilets were dirty, and the site was filthy" would not get on, where as "we stayed on this site for the weekend, we were disappointed that the owners were unfriendly, the toilet block did not appear to be cleaned very often and not during our stay... the same bits of loo roll were on the floor for the entire weekend, the showers were mouldy and the water was cold or luke warm and there was no mop avaliable for us to clean tup after ourselves . Also despite good weather the field was very muddy, and the rubbish bins were over flowing whoch seemed to attract a lot of wasps. I would love to return to this area, but would not return to this camopsite" would get put on.
My friend stayed on a site with no toilets at all (well none after 11pm on saturday - 8am monday, not good when away for one weekend) having specifically asked and checked that they did have loos .. anyway the 1st 2 reviews where he expressed his negative opinions were not accepted, but he was determined to warn other campers so once he wrote his negative review in a very factual way (making it obviouse to others not to go there) it was accepted