I've had the same opinion for years, and am often blasted for it by fanboys and metal newbies. Hell Awaits was Slayer at their peak.
Slayer - At Dawn They Sleep
Behemoth - Conquer All
This album will always hold a special place in my heart, as it was one of the first extreme metal albums I came upon when I first got into metal. Too bad I really don't like any of their newer shit.
I listened to it once a while ago at the behest of a friend who wouldn't shut up until I gave it a listen. Maybe one day I'll give him a chance again.
Repulsion - Black Breath