Screaming? It's more like growling than anything. I can see why most people wouldn't like them...they aren't very accessible. But as far as this type of music goes, they are one of the easier bands to get into. Isis' first 2 or 3 albums could be called Neurosis-lite but their later stuff is hardly that. If anything, they surpassed the Neurosis inspired sound long ago. I don't think anyone considers this band a proggy band either. What they write is fairly simple but pretty powerful.

Either way. It sucks they broke up but pretty much everyone in the band has released or worked on something since then and there's some good stuff out there. I'm most excited for the Mamiffer/Locrian collaboration coming out this month. I heard a few of the tracks and it is by far the best thing either band has worked on.