http://www2.kerrang.com/2008/06/metallica_preview_new_album_in.html said:
GUITAR SOLOS!
After abandoning the art of shredding entirely in favour of wet guitars and a drumkit made of dustbins on St Anger, were proud to report that Kirk Hammetts trademark greased-lightning solos are firmly back in place. Hooray!
METAL THRASHING MADNESS!
It must have stuck in James Hetfields craw to see the young bucks in Municipal Waste, Evile and Gama Bomb trying to nick his King Of The Riff crown from him. So, to remind these little gits exactly who it was who had a hand kickstarting the thrash movement, on the new record theres a cavalcade of mental mosphpit moments, as well as the man declaring himself a heavy metal riff machine.
DARK LYRICS!
Sunshine never comes. Show your scars. |Suicide, Ive already died!. On the new album, James Hetfields once again dealing with some serious stuff in his lyrics, making for some decidedly dark phrases. But its not all doom and gloom, he also declares that hes Up from the wreckage one more time. After St Anger, Tallica sure are.
LABYRINTHINE ARRANGEMENTS!
Placing dozens of riffs into maze-like arrangements and joining them up with cunning, tricky fills is essential to making classics like Master of Puppets twist and turn. Once again, Metalllica stick two fingers up to verse/chorus/verse and drop a cunningly designed carpet-bomb of riffola on us. Superb.
ULTRA-HEAVY PRODUCTION
Rick Rubins CV includes twiddling the knobs for Slayer, Mayhem, System of A Down and Trouble. If theres an expert of heavy, its him, and hes done a sterling job ensuring that Tallicas new album is heavier than a pregnant hippo. Although its much, much faster than that.