There are many great death metal bands out there, it depends on
the type you like. Not all death metal is the same. Some people
like Morbid Angel, but I prefer Cannibal Corpse.
I would recommend Cannibal Corpse, listen to "Evisceration
Plague" or "Priests of Sodom" (songs).
A good place to find what death metal bands you like would be to
listen to Death FM, an online radio station. The listeners chose
what is played.
"Death" is an excellent band
Deicide is good too