Well, you would read their methodology which they have posted and then decide if it's reliable. Opinion is naturally ranked downward in their methodology, so i

Well, you would read their methodology which they have posted and then decide if it's reliable. Opinion is naturally ranked downward in their methodology, so in a sense it is separated. The chart has been around for a while and is generally believed to be the leader. It's widely used in academia. It's a good tool but not bulletproof, and they admit the bias of their editors freely.