I've lost count of the amount of times I've told the same story but Metallica were the first band I obsessed over, buying guitar books and learning by playing their riffs etc. I love the Black Album and even Load/Re-Load have their merits.
But St Anger is probably the most disappointing album I've ever heard and it's so awful - time has not improved it at all. Death Magnetic was OK but pretty middle of the road - the new album is probably slightly better but it still sounds like something they could have knocked out in hours - ultimately they are a band, who's best days were decades ago.
As a musician and amateur producer, I read a lot about techniques and all that stuff - it's interesting to see how the way they made albums changed over the years. In the early years, Hetfield wrote pretty much everything, coming in with finished songs and Lars is said to be a good arranger of songs, who would refine the structures. Hammett didn't record any rhythm guitars (only solos) for anything until Load, where they abandoned the 'wall' of Hetfield-tracked rhythm guitars and embraced each guitarist having a side (panning both) to give it a more loose sound.
By the time they hit St Anger, they were writing in the studio (usually a bad idea) and from watching Some Kind of Monster, it's obvious this is why it turned out so bad. No real direction, recording songs in random sections to piece together into an incoherent mess...with all providing lyrics and music, which is obviously something Hetfield hated.. The best moment is when writing lyrics, Hammett comes out with the immortal line "my lifestyle determines my deathstyle", where they all piss themselves laughing at how shit it is...yet they LEFT IT IN!!
The funny thing is that throughout, Lars refers to a lot of riffs as "stock" - i.e. not inspired and middle-of-the-road but that's what they have now become...although better, Death Magnetic and perhaps to a lesser extent Hardwired (which has had 8 years of development) are full of of them - they are just a band that for me, have lost all inspiration and are throwing out songs that wouldn't be B-sides in their better days. I'd say the same of their live shows - the songs are great but they are quite sloppy and the aforementioned 'wall' cannot be recreated...they also look like they're going through the motions. You can argue average Metallica is better than most but they should just give it up IMO.