On the topic of adaptation, I would like to say more. The claim to artistic validity of most literary adaptations rests on their hand-me-down affiliation to high literary culture. They are the purview of a middle-class audience who think that high culture can rub off on them just by second-hand proximity to it in the form of a two hour film. This is of course why we call the bulk of these films "wine aunt movies" colloquially.
Watching the Shakespeare adaptations of Akira Kurosawa will only bring you closer to Kurosawa, not The Bard. This is not a bad thing as Kurosawa is himself at the pinnacle of narrative filmmaking. However, don't think you know Shakespeare because you watched Throne of Blood, even though you should really watch Throne of Blood, because it's great. Just remember that the author of a film is not the one who died hundreds of years before it was made.
I have not yet seen God Roman's Macbeth yet but I have heard from his afficionados that it is a great window into Roman's mindset after the death of his wife and son. Again, it seems that watching the adaptation will tell you more about Roman than Shakespeare.