Yeah so OK there was the Neimoidian bodyguards and a few organics here and there but why was the CIS exclusively made up of droids? I mean for example, why did they make BX-droid commandos? They were very expensive and weren't even up to par with organics. So just use organics during those really secret missions! But every single soldier is a droid! There's the B-1's, and the B-2's, and even the B-3's, and droidekas, and BX commandos, and hailfire droids, and spider droids, and dwarf droids, and vulture droids, and tri-fighter droids...everything is droids! Why?!?! The only thing I can think of is that the clone wars ended before the CIS could implement new soldiers. It was only around 3 years long, and I'm assuming the CIS saw how terrible their droids were to organics. If the clone wars lasted for longer than the CIS probably would have switched out their armies for organics, or at least have some organics within the ranks.