Why Play a Fighter? (DND/Pathfinder)

[Greenish]

to be fair, unarmed disaming usually ends with you beating a guy with his own weapon

Unarmed disarming ends with you wasting your attack, perhaps provoking an AoO for your trouble. If you succeed, congratulations, you're now holding a weapon you don't want use, or don't know how to use (monk proficiencies whoo!).