#10 Terrorizer
Terrorizer only released one album in their prime, so it would be a crime to list them any higher. What a classic it was, though. As far as grindcore bands go, they are right up there with the best of them.
#9 Kataklysm
One of the best bands to ever come out of Canada. And there have been some good ones.
#8 Anathema
A fairly difficult to classify band from the UK. More doomy than anything I suppose. A great band no matter the genre.
#7 Satyricon
#6 Korpiklaani
Korpiklaani are occasionally a bit goofy and esoteric for my tastes, but are always consistent an, most of all, fun. They certainly have their own rabid fanbase.
#5 Immolation
The OTHER brutal death metal band from New York. Maybe my death metal bias is showing through here a little bit, but they are an extremely underrated band.
#4 Ensiferum
The Finnish folk metallers have yet to write a bad song, despite numerous lineup changes. Few bands create such an epic battle atmosphere as they do.
#3 Suffocation
Suffocation obliterated melody and created what we refer to as "brutal" death metal. They were probably the heaviest band to date during their heyday in the early '90s, as well as one of the most technically gifted death metal bands.
#2 Metallica
What? You thought they'd be #1?
#1 Sepultura
The famous Brazilians were not only one of the greatest thrash metal bands of all time, but also a primary influence on the early death metal scene. And yes, I said were. We're speaking strictly Max Cavalera-era Sepultura here.