From one perspective, epigenetics offers a compelling narrative of life experiences feeding back directly onto the basic programming that makes us who we are. But the field also has some foundational controversies. In June of last year, a team of researchers from the Albert Einstein College of Medicine, Bristol University, and the European Bioinformatics Institute published a paper arguing that the field is plagued with misinterpreted results. The sources of misinterpretation included confusing cause and effect (diseases can produce epigenetic markers as well as the other way around); spurious and misinterpreted statistics; confounding variables which cause apparent correlations; and a large variability among the epigenomes of individual cells, which is usually not controlled for in experiments… More at Nautilus.
Probably the best article I have ever linked to.