Back in Billy Graham's hay-day, not everyone was thrilled about him. Theologians in particular were not so sure about his approach.

From this blog:

“The great Swiss theologian Karl Barth once stood in the rain to hear Graham preach in Basel. When he told Graham that the sermon from John 3:3 was good but should not have stressed the must in ‘you must be born again,’ Graham begged to differ (and was soon gratified to hear another great theologian, Emil Brunner, affirm his position). But then Graham closes this account concerning Barth with these words: ‘In spite of our theological differences, we remained good friends.’” (Mark Noll, American Evangelical Christianity: An Introduction, Blackwell 2001, p. 47)

Another important theologian, Helmut Thielicke, also attended a Billy Graham crusade, but with certain preconceived notions which put Thielicke in an ill disposition toward the popular preacher. However, after coming under the preaching of Graham, Thielicke experienced an awakening of sort...

In Thielicke’s autobiography, Notes from a Wayfarer, he recounts the situation:

My meeting with Billy Graham, who was at that time holding his huge evangelization crusades in Los Angeles stadium, was of great importance to me. I at first had reservations about accepting his invitation to sit next to him on the balustrade.

When I then did indeed do so on the insistence of my friends, I kept my eyes wide open critically. As the people came forward in their thousands to confess their faith, however, I was aware only of calm meditation on the part of his crew and detected no expressions of triumph. His message was good solid stuff. His warmhearted, unpretentious humanity made a great impression on me.

Afterwards I wrote him a thank you letter in which I confessed that whenever I had previously been asked for my opinion of him I had said that I felt that many essential elements were lacking in his proclamation of the Gospel; he advocated an individualistic doctrine of salvation, and even this took place only in relation to the initial stages of faith. Although I had now personally experienced his message, I did not feel compelled to revise the objective side of this criticism, but I had resolved to modify the question in which I raised my criticism; it now ran: “What is lacking in my and the conventional Christian proclamation of the Gospel that makes Billy Graham necessary?”

I found the answer he gave me extremely significant. I was, he said, completely right in my criticism. What he was doing was certainly the most dubious form of evangelization. But what other alternative did he have if the flocks that had no shepherds would not otherwise be served? This answer gave him credibility in my eyes and convinced me of his spiritual substance.

Graham would take Thielicke’s constructive criticism to heart, as exhibited in his later emphasis on continuing discipleship and the importance of the local church, the latter which caused him much criticism (from fundamentalists) as he worked with local mainline Protestant churches and Roman Catholics whenever his crusade would come to a town.

I don't know if Thielicke really deserves all the credit for Graham's later emphasis on continuing discipleship and follow-up, but I think we should give him some... :-)