Hatebreeder has the song 'Children of Bodom' on it. That song just musically kicks your fucking ass all the way through. I admit I never listen to that song anymore, but it's the song that made me realize how fucking insane this band is.
Also, Bed of Razors, Silent Night, Bodom Night....
The whole album has great vocals and the guitar work is fucking great.
I actually don't think Hatebreeder is the best but it seems like it is the album that appeals to the wideest variety of metal fans.