If I could, I'd give no stars, because, in my opinion, the main character was overly childish. Besides, his attitudes were just too rude and/or sexist to my taste.
I reckon the writer spent too much time describing the detective's love for food and distaste for exercise rather than building tension around the murder story.
When the crime was finally solved, I felt relieved the book was finished, but also a little sorry that the writer failed to involve the reader in the final process of solving the case. Maybe I was too bored to notice the toothbrush clue... well, I definitely won't read any other book of this author.