Have you read the accounts of the women he talks about? I think that at best he had a very different recollection of his relationships with the women he was involved with than they did. While the book recalls a certain experience the women do not feel they had the same experience. They bring out many inconsistencies. They often felt pressured to be part of his polyamory. At least one said she was often pushed to "fall in love" with someone else even though she was monogamous.
Perhaps it is an article that needs to be written.
More Than Two does have merit. It has been helpful to many people. However, I feel there are better resources.