Currently, characters that are not monks will often find themselves needing to take Improved Unarmed Strike in order to apply damage bonuses like Barbarian rage to their unarmed strike.
It's a feat tax that feels unnessary as any other melee weapon doesn't require an additional feat to be effective.
When characters take weapon focus: unarmed, if they don't already have the Improved Unarmed Strike feat, they should receive it for free.