Compare this to "The Flying Nun" or "Benny Hill" or "Chips" or "Married with Children" or really any number of other drivel. Shows like M*A*S*H were the far outliers in the past. Today shows like "Sherlock" are orders of magnitude better in terms of production value, creative content and acting than so much that came before. YOU may not be the market, but objectively (by market share) and subjectively (by critical and audience engagement) TV is attracting the best of the best in terms of creative talent.
There are a few contemporary exceptions of course, but there were so many great TV shows back in the 1970s, 80s and 90s in the UK, many you wouldn't of heard off in the USA.
The Ascent of Man
Portahouse Blue
Survivors (1975)
The Sweeney
The Life and Loves of a She-Devil
Hamish McBeth
I, Claudius
Tinker, Tailor, Soldier, Spy
The Beiderbecke Affair.
Edge of Darkness
Quatermass (1979)
Coupling
Cracker
Rebus
Callan
Boys from the black stuff
I could go on and on. Believe me there was nothing wrong with the acting on these TV shows. I would actually re rather watch 'Blakes 7' than Battlestar Galactica (2004-209) even without the glossy high production values.
I also do not like the levels of violence especially in todays American TV shows. If they ever made a remake of Columbo today there would probably by a SWAT team in tow.
I won't even get onto the state of the music today.