[ubuntu] Is "Web of Trust" a reliable add-on for firefox?

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http://ubuntuforums.org – If we want to get some idea whether a website (which may arise as a result of web-search) is safe to visit or not, it is sometimes said that "Web of Trust" is useful. However there are conflicting views about its utility. I would like to see what experts in this forum think about it. Sometimes when I am suspicious, I test safety of the website by getting opinion of Mcafee site advisor; though doing it often is irrititaing. Is/Are there easier way(s) to decide whether I should avoid visiting some suspicious looking website or not? I already have no-script but I have not configured (Hardware)