I agree, their early material is still excellent. I love their first three albums, very avant-garde and experimental but I love the juxtaposition of melodic/acoustic/instrumental with more harsh death metal passages and so forth. I think Ghost Reveries and Watershed is where they really started to sound way too much like a progressive rock band, but it was Heritage that was the final straw for me. I was just bored throughout that entire album. Their work since then has felt much the same way.