grindy

There's not much to explain. Once you get into it, you start hearing the "sense" in the music and just enjoying it.
If someone is only into softer, more melodic music, all extreme metal might just sound like stupid noise as well, but once you start really listening, you start noticing the structures and the skill involved.
A lot of Merzbow albums are pretty boring and half-assed, but on some of them and especially on his collaborations, you notice how he utilizes his noises in a purposeful, even masterful and often beautiful or just awesomely kick-ass rocking way.
You can't explain such music, one has to experience it like any other music and embrace what's going on. But ultimately it comes down to taste, I'm sure the "weird stuff" isn't just anyone's cup of tea, no matter how open-minded. I'm extremely open-minded and there are lots and lots of styles and genres I simply can't stand.

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A smell of petroleum prevails throughout.