This post will help you distinguish between good death metal and bad death metal. And before I go off making fun of any bands, I'll stop myself because I could post all day. And It wouldn't be fair. Once you get past the vocals of a band even as terrible as cannibal corpse, you can see the talent and sheer brutality that goes into even their music.

http://www.youtube.com/watch?v=QOb6JSQd-Qw

Bad Death Metal:

Anything with guttural vocals that lacks true talent and is lyrically and substantively rediculous and on the surface of things.

Good Death Metal:

You'll find here:

A list of well known Death Metal bands that range from being old and new, technical to somewhat melodic, although I avoided any Melodic Death Metal. I listen to all sorts of Good Metal, and am constantly finding new bands from all over the globe that play under it's diverse and well followed umbrella of styles, people, and sounds.

Ackercocke
http://www.youtube.com/watch?v=Eh2ZQ6YgOJM

Necrophagist
http://www.youtube.com/watch?v=gA4oq7DBU8E

Death
http://www.youtube.com/watch?v=i38m-xGX7io

Origin
http://www.youtube.com/watch?v=MIMW0aHN0ks

Cephalic Carnage
http://www.youtube.com/watch?v=KM1yhU0dBFM

Bolt Thrower
http://www.youtube.com/watch?v=GNO6ExX9Nl0

Atheist
http://www.youtube.com/watch?v=9vh7KOlWrHk

Cynic
http://www.youtube.com/watch?v=c5VzbQQEQo0

Carcass
http://www.youtube.com/watch?v=B7lP30tSZF0

Meshuggah
http://www.youtube.com/watch?v=qc98u-eGzlc

Martyr
http://www.youtube.com/watch?v=XOfa0kCRlgU