Hey there, I'm the site operator. This URL might help you better:
http://bitcoinx.io/exchanges/?tag=united-statesThe one you posted has both wallets and exchanges listed. The one I just posted is exchanges only, and in the US. You can also check the top highest rated exchanges on the right side of the page. I hope this helps!
If you are the site operator, then you should update the list with legit options. Options like Kraken and Bitstamp should be on top of that list, however I see them no where on the first page.
I don't think you understand how it works. The site is community driven, meaning we don't "rank" the bitcoin exchanges. Users do. We find all the exchanges out there, vet and list them, and then the community can come together and rate and review them. Many of these sites are known actually, just doesn't seem like you know them very well. Obviously there are more popular ones than others.