They are not really a death metal band it is just some thing in the name. Josh Homme, the cat in the back is quite accomplished.
His bands:
Queens of the Stone, Age The Desert Sessions Millionaire, Them Crooked Vultures, Jack Black, Kyuss
Them Crooked Vultures with John Paul Jones was pretty good.
Neither is their music: https://www.youtube.com/watch?v=3DLVLRpKtYc
Yeah, nowhere near death metal. Bluesy alt-rock ala White Stripes was my impression of them in my limited exposure.