Negative Reviews of Books

Occasionally authors will receive negative comments of their books. On my last novel published in 2013, Letting Go, and written under the pseudonym, Belinda Tors, a reviewer disliked the unsupportive relationship between a mother (the main protagondist) and her daughter. The mother had left her abusive husband and was going through a divorce. However, the characters in the novel were based on real people the author knew in life so she couldn't change their relationships! Although some reviewers may have idealistic views of the characters as if everything were written in Heaven, that is not so in real life or in novels. What makes a novel interesting is depicting struggles between different characters. If the reviewer wishes the interaction of characters to change, they should write their own novels depicting these changes. However, then it would be a different book. Even in Romances, there are struggles between characters or they wouldn't be interesting. Its struggles between characters which drive the plots of books. If I had changed my plot, the book would have been nothing but humdrum and sold few copies. How do some reviewers become reviewers?