It's more than "jock personality". In wartime, the glory hound can sometimes work miracles, but usually gets himself and others killed needlessly. Faramir, no less brave, is doing the dirty, dangerous work of leading a secret raiding party behind enemy lines. He's taking responsibility for the lives of his men, rather than dreaming of the glory of a miraculous victory using the enemy's most powerful weapon against him.
If Boromir hadn't his thinking clouded by his desire for glory, he would have realized that destroying the Ring would do far more damage to Sauron than any mere mortal trying to turn the Ring to his will against its own master.