I love them. I do think you should watch them in chronological order with Night Passage before Stone Cold and then they are chronological by release date. Though they are not really sequels, things that happen are referred to later.
Most definitely.
The only reason they did Stone Cold first was because Selleck had that book first and loved the story line and the character driven portrayal of Jesse, Suit and Molly. Of course, in the books, Molly Crane is a blond Irish-Catholic mother of four.
In the movies, Molly is portrayed by the awesome Viola Davis, who is definitely NOT a blond, Irish-Catholic.