The fodder thing really hurts them. Hobgoblins are always taking over forts and castles then getting pushed out.
Hobgoblins are more than samurai spartans. They are a whole race of militaristic warrior who use conquering as a way of life.
They should be threats in basic D&D settings as their butchers, bakers, and farmers are all professionally trained swordsmen, pikemen, and archers.
A player could really play up the "I'm a fighter and a (insert normal job)" as a hobgoblin. Full on chef's outfit with a scimatar and a katana.