On one hand, his policies were a disaster for America. He set the precedent for so many self-inflicted problems, from out of control deregulation to emotionally driven foreign policy. Today's Republicans all love him, that really says it all.
On the other hand, Reagan as a person was also horrifying. Ignorant, self-satisfied, racist, anti-Semitic and devoid of a real moral compass. If you actually go back and read his rhetoric, Reagan constantly used thinly veiled racism to win votes. That shows me either: Ronald Reagan was a horrible racist or he was happy to whip up racism on the theory that the ends justify the means. Just a disgusting, massive, massive HP.
The wound was already inflicted when he took office. The problem in the United States is that we generate about as much tax revenue per person as socialist European nations, yet we spend the money in incomprehensibly stupid ways.
Reagan has nothing to do with the problem.