My favorite quote about the patch from the devs is "This patch is not vital" - Swell. So in other words, it won't fix the BSOD I get when trying to play. I swear, I've had my current two boxes in their current configuration since Doom3, and this is the first time I've gotten a full blown BSOD. I wanna like BW2 so much...but can't.
EDIT: reading the patch readme shows that it indeed fixes certain in-game crashes. Apparently they don't consider game crashing to be vital to gameplay, since they state the patch (which fixes crashes) isn't vital. Ugh.