Rated 5 out of 5 stars
This is about the best WARNING add-on available. Most of the negative reviews focus on the fact that it's not perfect, but I think it should be judged by how
well it does what it claims to do.
Also, WOT uses more than user ratings; see Malware Domains (also available with Adblock Plus if your computor can handle the load) for example. The way they group users to weight opinions also reduces the risk of co-ordinated attacks.