By their own admission they are a "media watchdog and lobbying group", and by their repeated behavior, they are an progressive ideologically driven attack squads lead by their slime ball in chief, Brock, and funded, to a large extent, by the far left billionaires zealot Soros and Lewis.
Their corrections, aren't really corrections, but distortions that favor their ideology, and those of the same ideology, for consumption by those with the same ideology (Ever hear of the liberal progressive echo chamber? Well here it is in spades). Their corrections aren't to further anything but their ideology at the cost and impingement of anyone not of the same ideology.
A fair assessment would be to call them liberal / progressive ideological shock troops. Hell, one of their initiatives is to literally flood the news media with their wonk drones to drone on and on about the liberal / progressive ideology, and to put that spin on every interview possible.
Media Matters Mission statement: "comprehensively monitoring, analyzing, and correcting conservative misinformation in the U.S. media"
Their ‘correcting conservative misinformation’ is little more than using Media Matters as an attack platform against anyone and anything that disagrees with their extreme liberal / progressive agenda and ideology.
In essence, a purveyor and promoter extremist left-wing propaganda.
