My board name implies my favorite album. I grew up on Slayer and have been following them very closely so I can see what they were doing on every album. Not to be a know it all asshole, but IMO Slayer never made a bad album. Diabolus In Musica was not a bad album, not their best, but not bad. I personally think that today Slayers music is angrier than it's ever been. Show No Mercy, Hell Awaits, Reign in Blood, South, Seasons, those are all great albums I grew up listening to, but through the years their "new" sound has grown on me to the point where now the old stuff seems weak to me. The lyrics to the newer songs dont require a dictionary, but they are to the point and in your face. Slayer used to show their anti-Xtianity in a way that was vague and watered down, today they just throw it all out there and as a big fuck-you to the world.
I will admit Kerry King does try a little too hard in the fashion department, but that has nothing to do with the music.
Sure there are songs I'm not too crazy about, but then I listen to all the other shit metal out there and find myself putting Christ Illusion or God Hates Us All back in the CD player.
The old stuff? Hell Awaits, hands down.