i dont see how you can sit there and tell someone their opinion doesnt count because they dont like post SNM slayer, when you yourself write off all of megadeth (read: i dont like thrash metal) and all of at the gates (read: i dont like music).
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show no mercy is by far the best slayer album. songs like black magic, tormentor, metal storm - face the slayer, die by the sword, evil has no boundaries, final command, fight till death, crionics and the antichrist (i.e. the whole album) bridged the gap from NWOBHM to what you hear in hell awaits. without show no mercy, you dont have hell awaits.
i also agree the black album gets more shit than it deserves, but it is boring for the most part (like ive never actually been able to listen to the whole album in one sitting). but that proves my point - people give it heaps of shit, therefore its not overrated (generally)