Nowadays, I only review books I really like. It's cowardly, I know, but I figure it's not my job to make people unhappy. I'll leave that to the professionals.
Your writing voice is the deepest possible reflection of who you are. The job of your voice is not to seduce or flatter or make well-shaped sentences. In your voice, your readers should be able to hear the contents of your mind, your heart, your soul.