I'm A Banana
Potassium-Rich
So? 
A wizard still won't be able to hit the broadside of a barn with it, and even if he does, he'll soon have spells that will pale in comparison to what he can do with one of those bad boys. Also, a feat is a pretty valuable expenditure for someone who has a *lot* of feats available to them (item creation, metamagic, AND the general feats).
Heck, there's little stopping a Wizard right now from learning Expertise and Disarm and Whilrwind attack....
....how many wizards do you see with this stuff?
This certainly doesn't increase power by any significant margin. It just increases the possibility of a race wielding a weapon that the race is known for...heck, it makes sure that the various trained combatants in the race would be able to wield the weapon...
....otherwise....why is the orc double axe a special orcish weapon?

A wizard still won't be able to hit the broadside of a barn with it, and even if he does, he'll soon have spells that will pale in comparison to what he can do with one of those bad boys. Also, a feat is a pretty valuable expenditure for someone who has a *lot* of feats available to them (item creation, metamagic, AND the general feats).
Heck, there's little stopping a Wizard right now from learning Expertise and Disarm and Whilrwind attack....
....how many wizards do you see with this stuff?

This certainly doesn't increase power by any significant margin. It just increases the possibility of a race wielding a weapon that the race is known for...heck, it makes sure that the various trained combatants in the race would be able to wield the weapon...
....otherwise....why is the orc double axe a special orcish weapon?