Human marked the beginning of a major stylistic change for Death, being more technically complex and
progressive than the band's previous efforts. The sound has been categorized as
technical death metal and
progressive metal. Shaun Lindsley of
Metal Hammer said
Human was an "exponential leap forward in innovation" for the band. Chris Krovatin of
Kerrang! assessed, "On the one hand, the album sees Death, arguably the genre's birth mother, exploring progressive sonic ground and lyrical themes that were completely new for them, much less any other artist within this branch of music. On the other hand, naming your album Human – after the ultimate symbol of frailty in death metal, whose destruction, demise, and sheer repulsiveness are the subject of most great death metal songs – has a reductive brilliance to it." Described as a "swirling, progressive
shred-fest," Some of the textures on the album have been described as "
spacy." Masvidal explained: "Although we all brought our backgrounds to the equation, none of us really knew what we were doing. We simply did what came naturally in the context of Chuck's songs and that's why it worked. Our detachment about the process eliminated preciousness and pretense. It wasn't that we didn't take the music seriously, because we did, but there was a playful psychology along the way." Additionally, the album contains melodic guitar riffs that are reminiscent of the
New wave of British heavy metal, and have drawn comparisons to
Iron Maiden. Marcus Jervis of
About.com assessed, "Although firmly rooted in death metal, by this stage of its career, Death had little in common with the
gore drenched grind of
Cannibal Corpse or the satanic
blast beats of
Deicide, instead choosing to explore increasingly progressive avenues, expanding the boundaries of what was considered possible in death metal." The track "Cosmic Sea" is an instrumental that emphasizes Di Giorgio's
heavy metal bass playing. Schuldiner's lyrics on the album explore themes such as
existentialism,
abuse of power, and
betrayal. ==Reception and legacy==