I started this thread and then never got back to it to comment, but in reading it now I see that there were some very good posts and a lot of new and good information posted by others. I'm rather surprised. I thought my OP would get a lot of criticism, but it appears that few are willing to defend the MSM.
One important omission, no one mentioned "Operation Mockingbird." This was a CIA project that actually bribed journalists to give a story a particular slant. After it was exposed, the CIA said they wouldn't do it anymore but, AFAIK, there is no way for Congress to find out if they actually have terminated the program.
Another important omission, I think, was the internet. Yes, a lot of internet sites are unreliable nonsense, but the beauty of the internet is that you can check these things out, and a great many internet sites are accurate and outside (sometimes WAY outside) the mainstream media slant. Cenk Yugur is a great example of this and the most successful of the heterodox sites, but there are others including the likes of Glenn Beck and Alex Jones which have a very large following. Are these people always accurate? Of course not. They make mistakes. They jump to conclusions. Certainly, they are not unbiased. Sometimes they have to correct themselves or apologize for not checking things out sufficiently. But the MSM has all of those problems as well and added to a uniformity of coverage that serves the interests of a relative few people who have the power to control the news.
You also have access to alternative sites like Al Jazeera and RT on the internet. I wouldn't claim that these sites are objective either, but they give a different spin that information that is often suppressed by the US MSM.
By the way, I did not intend to suggest that the greater leeway allowed by reporters on RT necessarily meant that RT was, in some sense, a "freer" news outlet than Western media. I noted the "irony" that in some respects at least, RT allowed reporting that would get suppressed in the US. It is ironic, of course, because during the Cold War sources like TASS and ISVESTIA were regarding as paradigmatic examples of a controlled media. We cannot automatically make that assumption about RT even though it is a government-owned enterprise.