Don't get me wrong, I don't think particularly highly of the new Macbeth, I just don't find the period dialogue all that troubling. The bigger problem for me was just how ridiculously abridged and rearranged the script of the play was. It wasn't so much the Shakespearean language that made it confusing and tedious, but more so the omission and rearranging of so much of the play's dialogue that what was left told a vague and at times incomprehensible story.
Having acted in Macbeth as an adolescent, I'm pretty familiar with the play, which makes it hard for me not to just fill in the gaps myself while watching this, and then kind of overlook their omission when thinking about the quality of the film.
SO the cinematography is the best aspect, I certainly agree... As I said, I did find it interesting how he tried to keep the language and feel of Shakespeare's Macbeth, the problem was he abridged and rearranged it far too heavily and made the story utterly confusing and tedious.