Patrick McGoohan adds interest to the cast but you need patience waiting for the exciting bits in the screenplay. It would be quicker to read the book which would then defeat the whole purpose of the exercise.
Its best is after the fugitive on the run bit is over. The subsequent court scene is extremely well handled – its script, performances, and props. Needless to say, the location shooting is beautiful.
It doesn't take too long before it turns into a mini shootathon wasting a promising plot idea. A special mention for the clothing and wig people having to change Noomi several times and often quickly within a single scene.