and i am going to laugh...there's no defending it..."it's breakthrough" "it goes against the norms of music"....exactly. The norms of music include talent. Ouch
And I'm glad at least one other person agrees with me on this...if you want something heavy, Listen to some Gojira or Behemoth...not Anal Cunt or some other awful band.
Those arguments would certainly not be ideal starting points for defending the genre. Two decades old now, it has the usual batch of innovators and purists and isn't necessarily any more or less "breakthrough" than anything else. "Goes against the norms of music"? Well, there's a ton of problems with that argument, regardless of the style in question.
At the same time, your implication that grindcore is inferior doesn't hold much weight either unless everyone can: a) agree what "heavy" means and b) decide that heavier is automatically better. Like black, death, power or doom metal, grindcore has its own distinct qualities that the music strives for. You either like those qualities and think they translate into effective songwriting, or you don't.
I personally love the wreckless abandon and primitive urgency of grindcore. The classics like Terrorizer, Napalm Death, Repulsion and Carcass are cool of course. Some other favorites of mine:
Rotten Sound - Murderworks
Nasum - Inhale/Exhale
Flesh Parade - Kill Whitey
Phobia - Means of Existence
Bodies Lay Broken - Eximinious Execration of Exiguous Exequies
Catheter/FUBAR split
Birdflesh - Night of the Ultimate Mosh
Agoraphobic Nosebleed - Honky Reduction
Circle of Dead Children - The Genocide Machine
Disrupt - Unrest
Haemorrhage - Grume (I know, more like goregrind)
