MrZork wrote...
Honestly, I would be very stingy with this sort of thing, particularly since it is a class skill for classes that already have extraordinary combat presence or ways to debuff opponents.
Definitely this, especially for Weapon Masters -- which basically give up like 10-15% HP (via 4 less Epic Toughness feats) in exchange for gaining like 125% more offense.
This may also have the effect of effectively making Intimidate mandatory like Tumble. If we were imagining something like that, you could easily make Intimidate give a self-buff like...
1 AB at 5, 25, 45, etc (enemies are intimidated and easier to hit)
3% physical immunity at 10, 30, 50, etc (enemies are intimidated and deal less damage to you)
2 damage at 15, 35, 55, etc (your intimidation allows your strikes to do more damage)
1 AC at 20, 40, 60, etc (enemies are more scared of you and hit less