Speaking of Metallica in the early nineties was talk of further reference and influence of heavy and thrash metal (genus which were precursors with bands like Overkill and Slayer) and even rock in general in the world, so their musical change and physical from disk Load generated a great discomfort among the most loyal fans of the band and at some point I actually thought the same but when you stop to analyze some interest discography of the band realizes that never really sounded like and that the band in its genre: metal, came to do alone versions of itself.
From Kill 'em All the more influenced by youthful fury of punk, to Masters of Puppets where issues are not as fast as he used as Welcome Home (Sanitarium) to ... and to Justice for All album a listen thought, with more complex and influenced by mourning the death of their bassist lyrics Cliff Burton was an evolution in terms of musical complexity but widely criticized in the quality of its blend not differentiate both low perhaps because it is not yet felt Jason Newsted, the newcomer bassist, as a member. So when you stop to think (even being a musician would be understood) without hondar much, that after turning almost 4 years with its commercial success the eponymous album also known as The Black Album which took a commercial turn pulling perhaps a heavy metal much more accessible to the masses, the change for the next album would be more drastic and in my not so unintelligent view and even necessary if one also begins to think that the only music they had heard the Metallica was not Mercyful Fate, Misfits and Motorhead and had a wider range of influences as demonstrated in collaboration with Lou Reed, Lulu.
For me the Load and Reload albums offer a more bluesy Metallica came very close to hard rock without doing anything wrong and without losing their malice regardless metalera heavy commercial reasons. Listen to them without thinking about the band or Kill'en All Black Album Metallica but in another and I assure you will not regret.