i can definitely see where you're coming from with this, especially with the way the attention came down when the style was coming up. SG never really fit into any specific niche and for me that's one thing that made them really great, by not being 'first tier' i didn't relegate them down to 2nd, i moved them up and out of the pile - but it took me a while to first 'get' the band.
i also think one of the main reasons they didn't get talked about that much after the fact is that no one in the band self-destructed. there was no out of control ego, no power tripping madman, no public freak outs, lawsuits, etc. the lack of sensationalism didn't endear them to the masses of star****ers out there. consider what people talk about when they discuss banRAB from that era... who talks about the actual music of Nirvana, AiC, or STP more than the heroin abuse and the 'denied potential' of those banRAB?