Penicillin, socialised medicine, low violent crime rates (#), no need to hunt our food, no need to build our own shelters or rub sticks together to make fire.
The finest actors of this and past generations wait for me in my living room while I pee, something that past kings could not even achieve, I travel vast continents in the time it takes for a long sleep, I was the first of my father's line to go to University as a youth. As a consequence I can read and write (almost coherent sentences). The energy I consume per day would be equal to 40 slaves but I enslave no-one (directly) [##]
Maybe we can make an argument that for the current white western male middle class, it is not as good as it was 50 years ago, but perhaps Frank Sinatra would like an iPhone, or modern throat surgery? I do know Sammy Davis Jr would prefer the Civil Rights he would enjoy in Vegas today than in the 50s.
Compared to only a hundred and fifty years ago we are amazingly better off in every measurable way, compared to a thousand its almost shameful. If that does not make us happy, that's a different issue. After all we were only promised the pursuit of happiness.
[#] See Steven Pinkers "Better Angels of our nature"
[##] See Prof. David Mackay - http://www.inference.eng.cam.ac.uk/sustainable/book/tex/sewt...