This Slaughter plays extreme thrash, in the vein of many of the South American extreme thrash bands like Sarcofago and the Chilean Pentagram (but predating them). With a punk-influence, it's raw and primitive as fuck noisy thrash.
What makes Slaughter so special is the animo with which they made their uncompromising speed-assault. When Slaughter plays, both they and the audience are having fun. Each song is recognizable simply because of a signature riff, or the lyrics. "Make way for the INCINERATORR!!" or the riffs for Tyrant of Hell. "TALES of THE maCAbre" with that typical vocal-line is my personal favorite, although it's the slowest song on here.
When you get the Nuclear Blast cd-version with the Live Toronto show (a whopping 12 bonustracks!), and I do recommend you do, you can hear Slaughter in action live. The sound isn't great (sometimes part of the vocals get a bit drowned out) but overall it's pretty decent. The main thing is the crowd-interaction; sillyness galore. Slaughter also performs some tracks not on the original album, among which a Venom and a Hellhammer cover (fitting their sound perfectly). If you're a fan of Slaughter, and you see the Nuclear Blast version cheap, it's IMO worth it to get if you don't got the live tracks on your version.
Slaughter isn't about a refined sound, but more about fun raw music.