The Factotum scoffs at your "only so much in a round" nonsense!
I think Archivist//Factotum//Warblade would be absolutely silly. For more action spamming, consider Archivist//Factotum//Binder, with Zceryll so you're spamming creatures that have their own actions too. Yehaw!
As to why Wizard//Druid//Cleric is bad, the stat issues. You want to focus on one stat, so you wouldn't want the Int caster in there. However, Druid//Cleric//Unarmed Swordsage would be solid.
JaronK