No, it doesn't kick arse here neither. In fact, BlitzQuake has never worked here.
I have now got a freshly installed OS3.9 with Boing Bag 1 & 2... Er... Let me think... The mediator software installed aaaaaand.... PowerIcons & MCP... That's all I think & BlitzQuake does the same thing it's always done. It loads a little then the system locks up, no mouse movement, no drive activity, there are only 3 keys that get me out of there.
I can get the QuakeGL version working from the unofficial mediator site working, but this has crazy polygons being drawn all over the place they shouldn't be.