i don't like this tone. sorry but i can't find a softer way to say it... it lacks punch and presence, but of course i can't tell if it comes from your rig or from a bad EQing... i don't like metallica at all, and i always hated their tones as well - so my judgement is biased - but you should "open" it up a bit, to make it sound a bit more thrashy and aggressive.
that's just my opinion, of course!