They have a history of being bribed or otherwise convinced to mark unsafe sites as safe. E.g. Once in the past: Today: (I clicked on the first image on Google and got the second one.) And there are more sites like AdwareAlert, Uniblue, etc. Hell, they still have StopZilla as green. Seems like your users did, McAfee. Good job. About the Avast question, I don't know, sorry. I never used their WebRep. Avast is a good antivirus though, so I doubt the ratings can be bad. As for WOT, it's definitely better than McAfee. Saying that "WOT can be biased" is like saying Wikipedia can be biased. Yes, it can, in theory, but it rarely actually is. WOT is used by everyone from the average user to malware experts, and that's exactly the good thing about it: rogue authors are not going to bribe the users to spread good lies about them. They're going to bribe McAfee, and by that, I mean companies in general.