According to the Center for Economic and Policy Research, only 24.6 percent of all American jobs are "good jobs".
They had three criteria for what a "good job" is:
#1 The job must pay at least $18.50 an hour which is the equivalent of the median hourly pay for American workers back in 1979 after you adjust for inflation.
#2 The job must provide access to employer-sponsored health insurance, and the employer must pay at least some portion of the cost of that insurance.
#3 The job must provide access to an employer-sponsored retirement plan.