NSV has your typical song structures like say 1,2,3,2,3,4,solo,2,3,2,3,4,1 etc..... and no the songs are not dissonant or not normal. I was wrong when I said highly structured but they still could be considered highly structured because they repeat a lot and seem compact and do not stray and remain catchy so people considered it to be great songwriting. I have always seen Cryptopsy(early),Morbid Angel,Cannibal Corpse,Deicide to have pop like song structures either because they are lazy, do not want to take time and remember odd song structures or just cant do it and it can bug me at times. I myself like more weird structures and constructed and songs being dissonant and odd in the guitar department and structures when it comes to death metal and I dont want to know what to expect next in the song. I like to be caught off guard and have climax's. Most bands with very repetitive songs I can only listen to 2,3 songs from 1 album sometimes not even a full song especially in death metal.