Cadge seems to be caught between the worlds of reportive ethnography and stuffy academia here. When she is in full reporter mode, charting interviews and describing her experiences, her prose feels so much punchier and more alive. But when she gets stuck in the requisite academic paragraphs detailing theses and the like, things go very flat very quickly. Cadge seems quite uninterested in writing these parts of the book, and it shows.
As for the observations, I think it's interesting but not terribly surprising to see the way that white laypeople in America appropriate the elements of buddhism that they find useful and disregard the rest, looking down their nose at the more traditional Thai elements of the religion as backwards. I wish the book was willing to take more of a stance on this issue.