I am a fan of Presuppositional Apologetics, so obviously I disagree with Sproul's Classical Apologetics. However, he was actually one my all time favorite theologians, mainly because I learned so much about Reformed theology from him.
When New Calvinism first came on the scene, Conservative Reformed and Calvinist theologians and pastors such RC Sproul liked what he saw, because he was seeing younger people interested Reformed Theology. RC Sproul of course had some warning, as did other older Reformed pastors about their direction. He continued to encourage them for a while, however after a while he and people like John MacArthur, started speaking out against them; mainly because New Calvinists had redefined what Calvinism is. Many of the New Calvinists were Charismatics and started to see false teachers involved in the organization. The movement is all but diminished now and many of the people who were involved in the movement have gone woke. Some of them, have personally gone against John MacArthur and Ligonier ministries for their strong stand against the Social Justice Movement and MacArthur's 'Strange Fire Conferences', of which if memory serves me, RC Sproul was involved in at least one of them a few years before he went to be with the Lord.

Tom