The all so rabid warises* over at SDN, are still complaining (going bats*** crazy) about how the evil "trektards" and the other "retards", think that three million clones makes sense. Now in SW Episode 2 there is only 200,000 thousand clones in battle with a million more on the way. The Kamino cloner states that it will take time to grow more. Also it took a decade for the first 2 batches to be grown. So three million at the end of the war does make sense. Because as seen at Naboo, planets have their own defense forces. So all the clones would be doing is providing assistance, as probably better trained and equipped soldiers
Note these warises are also the ones who think George Lucas doesn't matter.