i don't get why people think the drums are TUNED badly... sure, they're not the best sounding drums i've ever heard, but it's not the tuning that's the problem - they're WAY too high in the mix, and way too dry (i.e. absolutely no reverb on them). that mastering problem that's been mentioned also doesn't help, since everything's been compressed to shit, there's no dynamics range to speak of, and the drums and rhythm guitars especially suffer from clipping (distortion, in the undesirable, un-metal sense).
that said, i think the SONGS themselves are some of the best they've done in years, and the vocals are much improved, if only for the fact that hetfield's cut out that annoying "HEY-AH" cowboy twang he's been affecting for the past decade.