i have only heard the title track from st. anger i didnt like it too much but thats my taste. during the black album james blew out his voice so they way he sang changed. musically speaking after the black album metallica was no longer a metal band they became a pop(ular) band. this is where the music changed the most because they geared more for a causal fans base then hardcore metal heads. the video for the unforgiven 2 (reload) is a good example of trying to appeal to the younger crowd that was into soundgarden stp korn tool and rage against the machine.

but thats my two cents