What books would make better movies/TV shows?

I remember reading A Game Of Thrones and not thinking too much of it but the HBO series is very good.
I was thinking maybe “The Third Policeman”.
Maybe some military Sci-fi by David Drake.

I thought that Joe Hill’s Heart-Shaped Box would make a good movie. In fact, while reading it, I often pictured the scenes as playing out on a screen.

I’m a bit torn about his other novel, Horns, but have decided that it would not make a good film property.