I'm not really a fan of death metal (or any metal, for that matter), and most of my experience with the genre stems from my love of Adult Swim's
Metalocalypse, but a co-worker of mine recently introduced me to this stuff... My appreciation of jazz and math rock have allowed me to at least get into Fallujah's instrumental tracks... I guess this is a sub-genre known as ambient death metal? I dunno, but it's pretty solid, technically-speaking.
The Flame Surreal
The Harvest Wombs