This add-on bases website's rating only on user reviews. Usually the ratings are true and helpful. But sometimes the reviews end up false. For example http://www.minecraft.com/
Take reviews with a pinch of salt.

Also, it sales your private data to third parties.

"WoT's "Active Protection" actively tracks and links your IP address to what you type on search engines, your web history, then "distributes" (or sells as some websites have warned) this information directly to others.

Taken directly from their Privacy Policy: "When you install and use the WOT app or WOT extension, we also collect from you automatically... Internet Protocol Address...Search engine results page (keyword, order/index of results, link of result, title, description, ads); web pages visited and time stamp of the visit;"" - SandpaperWasteland