I have had the cd on constant play these last few days and find it extremely high in quality. The disc gets better with each successive spin. It is way more varied in songwriting than what a few online reports have been saying; and everybody shines on this with their performances. An easy top ten album of the year for me. Top notch packaging as well.
As for the 'modern' mastering, after some 35 years of metal, my ears really don't pick up such things.