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you should use those sites as a guide, not as a rule.
Absolutely 100% correct!!
WOT utilizes a particularly vulnerable system of ratings. User input is fine but also susceptible to ignorance and open to abuse. Had a case very recently where a forum I frequent regularly banned a member and he badmouthed that forum site on WOT. He submitted some nasty and inaccurate comments and, of course, rated the site very poorly. The site is actually very well administered, very well moderated and extremely safe.
I have also seen many, many red ratings on WOT with associated comments suggesting that the site appears in a list of rogue/unsafe sites. I have checked those lists and found no mention of the targeted site whatsoever.
Common sense is key - do not take the ratings as being gospel, investigate further yourself. Apokslipdyd put it very well - be careful, not afraid.