The book isn't being pulped in the Americas, so getting ahold of one won't be particularly difficult. From an academic perspective, there isn't anything wrong with the project she tackles. The reason that people are angry over her work is tied up in a lot of different problems. The postcolonial perspective views her work (and that of others) as being burdened by the old political relationships. What gets Doniger in the most trouble, though, is the subject material she is engaging with.

She especially likes to take religious practices and demystify them (IE: talk about them in plain language, without mythic structures supporting them), as well as consider the social and cultural implications of those practices. We're talking about very transgressive stuff, particularly with tantric Shivaism. Everything from sex to eating rotten meat and drinking out of human skulls. These are very, very uncommon practices, but they hold an important place historically. Her modern opponents object to her treatment for a number of reasons. Some people object on religious grounds- many traditions hold that their practices are impossible to understand for the uniniated. Others argue that that information is secret, and should only be passed down teacher to student. Those in particular often view western scholars as "stealing" knowledge and releasing it. Others object to the connections she draws between religious practice and social & political developments. Fundamentalists sometimes just don't want those practices that could be deemed socially (or even worse, culturally) unacceptable in the public sphere.

Essentially, her book is an interesting and valuable reading of the Hindu tradition approached through very rigorous scholarship. It's a good read, and worth picking up.