Wrong. Allow the fighter to lead armies. Significant difference. The player doesn't want to lead armies or focus on Diplomacy to strike accords with the enemy force? He'll at least still have access to stuff like Sense Motive and Bluff, both of which are quite useful in and outside of a fight.
Definitely not all that it needs, but as is, the fighter is a complete joke. So the fighter can hit stuff over the head. The party's illiterate barbarian can do the same thing, and he is better educated than the fighter is.