I don't find them inaccessible...just boring.
To be fair though, i haven't given them a proper listen yet. Just a handful of songs which i have on my comp, along with some on radio, which just bored me after sometime.
I really have trouble getting into the unintelligible guttural screaming vocals in alot of metal stuff. Often I'll be listening to the intro and really digging the music and then the singing starts and it just puts me off.
I know, if you paid attention I never said anything negative about Branca as an artist, just stating the fact that he does have some really inaccessible material.
My father's a Yes-man and I was surprised - he's got virtually the same taste as you. When I went to borrow his Close to the Edge album to rip it onto my computer, he told me that it wasn't nearly as good as Relayer or Fragile.
Metal Machine Music is probably the hardest album to get into, for me.
Either it's an elaborate joke, or it's like Ulysses by Joyce...a purely academic endeavour, an achievement to understand rather than an entertainment to be enjoyed.