Merton is a controversial figure.
This is what Anthony Clark of CA said of him:
"Nevertheless, some of his ideas are dangerous. His later writings are more confusing than helpful, for they conflate and confuse Buddhist and Christian teachings. One example of that confusion is seen in a popular icon sold in many Christian and Buddhist stores that depicts him sitting in the lotus posture in Zen meditation. The night before his death, Merton told John Moffitt that, 'Zen and Christianity are the future.' This is precisely what the Holy Father has expressed grave concerns about." (
Can You Trust Thomas Merton?)
I never recommended him to people.