'Heartwork' has great songs, but the solos kill it for me. I'm on the other end of the spectrum from Nagle - I want riffs and melodies, not shredding. It would probably be my fave if it wasn't for the wankery.
Being said, 'Symphonies of Sickness' is a grind classic. Not for everyone, but it's got tons of energy and is just total brutality. And even if you're not into it, you can't doubt its influence - look at all the imitators who are STILL trying to remake that damn album: Exhumed, Impaled, County Medical Examiners, etc. etc...