There is about a 20% chance that any particular summoned titan will be a Commander as opposed to a Unit.

The afflictions are random. But feeblemind and mute are fairly common. Gift of Health can usually heal their afflictions in 2 or 3 turns.

The spell is appropriately Level 9. Even having a semi-afflicted Unit that has the kinds of statsitics (especially HP) that the Titans have for 10 Death Gems can turn your armies into superpowered, hard to kill units with a powerful cavalry.