Not for everyone. E.g. lower-income married couples, and married couples with one worker, both receive more in benefits than they pay in. And when we include Medicare, everyone receives more than they paid in taxes.
It isn't a Ponzi scheme. Just saying so suggests that you don't understand how Social Security works, or how Ponzi schemes work, or are just using an inaccurate insult because it's politically expedient.
A Ponzi scheme is a fraudulent system where the organizer uses funds collected by the later "investors" to pay off the new "investors." No matter how fast it grows, it is unsustainable. Social Security, in contrast, is a pay-as-you-go system, so current revenues pay for current outlays. Surpluses from the year's collections went into the trust fund. It's been sustainable for about 80 years so far, albeit with a few tweaks.
Given the major demographic shifts since the 1930s (significantly longer lifespans, women working in larger numbers, changes in birth rates) and the lack of adjustments to Social Security, it really shouldn't be a surprise that the system needs further refinements at regular intervals.