I understand that the centrifuge gives some materials that you cant get otherwise (silver ore is not in default IC2, but needed to make glass cables, etc.) but in a modpack where it isnt necessary to get those materials that way, the balance of the three ore processing machines pushes players to *not* make the additional machines.
MAcerator: cheap to make, cheap to run, EASY to run, doubles ores.
Ore Washer: cheap to make and run, a bit more involved to run (water) and gives a few tiny dusts, which require auto crafting to make into full dusts. Overall maybe a 1.2x ore bonus?
Thermal Centrifuge: expensive to make and run, also just gives a few bonus dusts.