Even if they arent actual family members, the inclusion of the religious traits allows you to zerg rush the enemy with religion, eliminating unrest within one or two turns. The fact that said general also gains things like Superior Cavalry General traits and other neat things, they can be used to dominate the battlefield. One made-to-order general of mine gained enough experience (two gold chevrons) to clear a path through a walled ERE city with 500+ defenders all on his own, using a spy to open the city gates. He won with no casualties.
I believe four turns for build time is a meager price to pay for power.
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