The greatest revenge movies offer gripping stories, intense action, and cathartic satisfaction, from the over-the-top Kill Bill to the stylish John Wick.
Without Oldboy on the list at all, I can't take the site or the author seriously. None of those movies even come close to the horrifying revenge of Oldboy. It evokes a special kind of darkness that stays with you long after viewing.
To those in this thread who may not have seen it yet, make sure you watch the original Korean movie. The makers of the American version didn't have the balls to get the story right.