Remember the media is a general term. There are some good outlets out there, particularly foreign ones. But yes the vast majority of media outlets have numerous problems. Part of the problem is that marketers are smarter than ever. Whether it's to sell a product or an idea, they have been researching the ways to influence the human mind for decades and decades now, and some of their tactics utilize the media. Even worse, the news itself it now marketed towards demographics, essentially selling a product in the form of an echo chamber. All this taints the integrity of the information we are getting.
The 24hr news cycle is relativity new, and get's blamed for a lot of the problems. News outlets must compete for ratings, which drives them to sensationalism. Now that online and social media have come along, there is a perfect storm fostering the return of yellow journalism.
I also have a personal hypothesis that many people, at least in America, are too easily swayed and satisfied with pretentious cosmetics. It only has to quack like a duck, and no one cares to check and see if it really is a duck. We have a vapid generation that was never taught to strive for anything deep, because there are no losers. Everyone who plays gets a trophy. Every test answer gets partial credit, because at least they tried. They grew up with Nike telling them "just do it" and and BK saying "have it your way", and watching people like Paris Hilton and Anna Nicole be celebrated for nothing more than being vacuous. They go to colleges where they were recruited by predatory advertisements making superficial promises for the purpose of filling seats and securing loan money. They sit and pretend to learn, the teachers pretend to teach, and then they get a pretend degree so they can go out into the world and pretend to do a job. The worst part is that they are completely satisfied with the pretending; pretending they have a career, that they are loved, that they have informed opinions, and that they understand the world. They do this all the way up until the end when they pretend they're not really dying, but going somewhere else.
You can see this manifest in the current PC movement and in the form of social justice warriors. They have no problem pretending that something they've read/heard/seen is offensive, sexist, racist, classist, ect. They do not have the ability to think deeply, and so if you object to their accusations in any way, they wont be able to follow you, and decide you are offensive as well. It looks like a duck, so it must be a duck. They are unable to understand hypocrisy, so censorship somehow becomes freedom of speech. If you are not aware of the recent spat of speakers being uninvited to colleges, comedians being shammed off of Facebook and Twitter, or do not participate in arguments on social media, it may sound as if I am being cynical. Perhaps I am.