Graphics whores like me go to Lineage 2 and EQ2. Blizzard will never make a game that contains new graphics technology, as their fanbase majorly consist of low-end PC gamers (which is not necessarily a bad thing, as it sky rockets their profits.) 'nuff said
As far as framerate goes, everyone knows Sony Online Entertainment can't code a graphics engine with acceptable framerates if their life depended on it (SWG anyone?) And Blizzard has no 3d design experience whatsoever unless they recently hired a slew of new employees. Wouldn't surprise me if it ran sluggish even when low poly.
I like L2's unreal warfare engine (excellent framerate even when 200+ people are on the screen at one time.) Same goes for city of heroes.