People who can't get their basic needs met are pretty much guaranteed to be miserable. You won't be having a great time if you're hungry and shivering in a refugee camp. For these people, more food, better shelter, and better access to medical help makes a clear and enduring improvement in their level of happiness.
Something starts to shift at the point where neediness gives way to "enough." From then on, greater prosperity only drives higher expectations, ensuring a permanent subjective state of unfulfillment. Other than literal starvation, it's hard to visualize a purer state of stress and misery than that caused by going bankrupt over your second vacation home on Mars.
So nobody's happy. Or at least no one's happy for very long. People actually develop a tolerance to their own "feel good" hormones—dopamine particularly. They start to need greater and greater amounts of dopamine in order to get the original effects—exactly as if it were an addictive street drug. This kind of tolerance is called the "hedonic set point," and once you've raised yours unsustainably high, it's difficult and very unpleasant to lower it again.
So does anyone love life? Some do, for fleeting amounts of time. Mostly we're all somewhere between miserable and agreeably apathetic, though.