Let's review an important fact: Any version of Shakespeare that doesn't feature the original text can only be intolerably watered down, both in terms of dialog and subtext.
That doesn't mean that a Shakespeare-inspired tale cannot be a success (witness Forbidden Planet, or Rosencrantz and Guildenstern Are Dead). But this BBC re-imagining of Macbeth was a success only as a low-key standard drama - as such deserving perhaps a rating of 6 or 7. However, I have to evaluate it as a version of a Shakespeare story (which it was presented as), and as such it was sorely wanting. It was unbearably decompressed, to the extent that it felt like nothing was going on, and everything moved too slowly. It was Shakespeare Lite at its very litest and its most simplistic. You could be entertained by it, but you could learn very little about Shakespeare from it. I once saw some soap opera movie modeled very loosely on Othello (only with a happy ending). It was quite worthless, and this movie is in the same category. Actually, this should have been marketed simply as a slightly Shakespeare-inspired drama in its own right, and not as a modern version of Shakespeare, complete with the original play's title and all. Because it doesn't even begin to live up to the thing it's based on.
5 out of 10.