We don't have cable so don't watch CNN except for the occasional clip posted to FB.
My general take is that they tend to sensationalize things and feel a need to fill up airtime because of their 24 hour news cycle. We were in a hotel once and they were giving 5 minute updates a couple times each hour about a missing boy scout in Texas (who had wandered off on a camping trip and was eventually found). Venezuela might have been melting down, but we got updates on a boy scout. They also have foaming at the mouth op-ed programs on current issues--mostly politics-- that are not particularly measured but good at stirring up passions.
Despite that, they don't really offer as reliable coverage as BBC World, Deutsche Welle, RT (Russia Today) or NHK World-Japan. All of these are available via free over the air broadcasts in our market. The US equivalent of BBC, PBS (Public Broadcasting Service), has The News Hour, a nightly hour long program that offers more in depth coverage than the major networks: ABC, CBS, NBC. Fox is generally understood as a partisan mouthpiece that is unreliable as a news source. The regular network news is ok as far as it goes but often repeats information available online or via text sources earlier in the day. Local and breaking news are often best sourced via television. That's about it.
For newspapers, I rely on the NY Times and the Washington Post for national and international news. That's probably more than you wanted to know.