Death Company get 4 attacks on a charge, (3 when not charging) jetpacks, feel no pain, and furious charge. And they;re dirty cheap ;-)
Besides, My brother plays Khorne sometimes...they suck mightily. No firepower and they have to blindly charge whatever;s closest. My blood angels have some awesome (but limited) assault capability, but we;re still marines. We can still field lascannon tac squads, HB/AC speeders and the like, and as long as my chaplain is alive, my DC can move wherever I want them to, not just running after the first unit they see.
My BA slaughter hsi world eaters regularly