I remember seeing thie series on the TV many years ago, and I wondered how it would compare to my memories.
The bad stuff first: this dates from the time when the BBC used videotape, rather than film. Everything is studio-bound, and all the sets, even the most ambitious, are obviously just that, with multiple shadows. The picture quality is also soft, though the colour isn't too bad. As for the box, it contains precious little about the production: shame on you, BBC.
The good stuff: the artificiality actually helps, as you start to see this as a theatrical production, rather than a realistic one. And as such, it is tremendously gripping, with Graves' words impeccably transferred to the new medium, and a dream cast, with no weak link. Almost immediately you are drawn into the plot (Claudius doesn't actually appear for ages, but you don't care), and you are held until the end. Yes, it really is that good!