Hypocrisy?

I gave a quick listen to Obsculum Obscenum (had to check the name..) and Into the Abyss but the singing sounded like shit. So I purchased Arrival. Will have to see if it sounds more decent with my speakers than with the fucked head phones in the store.. but at least the sound seemed ok.
 
I'd recommend their debut album, Penetralia. Its straight up fast brutal death metal, but it has some of the best riffs I've heard for that genre.

Osculum Obscenum was the same type of stuff, but less fun.

Then they slowed all the music down and it just became boring in the later albums, till they finally got back on track with Virus. Virus kept the melodic elements of the post-osculum albums but added the speed back.

I'd recommend getting Penetralia and Virus for the best of both worlds.
 
Seriously get Abducted(epic songs such as Roswell 47, Killing Art, The Arrival Of The Demons Part 2), Virus(the whole album is badass) and The Final Chapter(legendary cover of Evil Invaders!).