I agree.  To think that the best performing and most respected cable news channel still has 1 out of 5 things that were rated turning out to be lies is pretty horrible.
Still though, for Fox News ~60%?  That's absolutely insane.  True the sites only rate statements that are controversial or noteworthy in some way, but still that means you are more likely to get things right by believing the opposite of what Fox News tells you about any controversial issue.
Although honestly I don't know why anyone watches cable news.  It's just drama programming.  My guess is that as the population ages those channels will go away.
		
		
	 
It's an interesting analysis, but it has one substantial caveat:
"They only include statements made on that network by a pundit or a  host or paid staffer. That means they do not include statements made by  elected leaders, candidates or party officials. We feel it’s difficult  to hold a network accountable for the comments of a politician.
"Also, if a Fox News host appears on NBC and makes a claim that we  fact-check, that rating would appear on the NBC page, not the Fox one.  In this case, it’s about the network that aired the content, not the  person who said it."
In short, it measures how likely one is to hear truthful comments on the network, regardless of the person speaking.  In many cases (though certainly not all), the lies were not told by the networks' regular staff, but by guest pundits.  I don't know how a network can prevent this without scripting every show and preemptive censorship.  Regardless, it's a pretty sad showing.  Don't believe everything you hear on television.