For every Game of Thrones, there are a dozen more like Jersey Shore, Desperate Housewives, 16 and Pregnant, Toddlers and Tiaras, etc.
US TV programming is primarily focused upon mass-market appeal, which more often than not means dumbing everything down to absurdly simplistic levels. I don't even have a TV subscription, mostly because I simply don't watch many programs, but also just sifting through all the garbage is such a major chore it's not even worth my time.