Television has really dumbed down over the past ten years.
v. (Slang) simplify complex information to make it more easily understandable, lower the intellectual level of something (such as a book)
Dumb something down or dumb down: Make or become less intellectually challenging
If you dumb down something, you make it easier for people to understand, especially when this spoils it. No one favored dumbing down the magazine. + dumbing down dumb·ing down He accused broadcasters of contributing to the dumbing down of America