Unregulated capitalism is terrible for the average citizen. I've read horror stories from the late 19th and early 20th centuries when capitalism ran unchecked with barely any oversight. Child labor, radium girls, company towns, workhouses. But when properly controlled, it can be great for a country. I was born when my country was still mostly a centrally planned economy. From the stories my parents and relatives told me, it was absolute hell to have a private enterprise with only people employed directly by the state and central governments having secure jobs, pensions, free housing and regular salary increments. Constant and unnecessary audits, opaque bureaucracies and ridiculously high income taxes were the norm not the exception. Only those who bribed the right officials would enjoy smooth sailing in private business.
On a personal level when I was born, there was only one single telecom provider, state-owned of course. They were so inefficient and corrupt that it took two years to get a landline from the time of application. Today with multiple telecom providers in the private sector, it's only a few days at most. Wouldn't have been possible without capitalism.
Capitalism strangely enough allowed my parents to do well for a time. Poor financial planning and bad luck changed it in the end which is a part of the reason why I'm here.