Looking back over recent historical experiences, prisoner abuse has delivered little, if any, of the intended results. The Israelis stopped using humiliation practices back in the 1990s because it pushed prisoners too far and delivered minimal results. Pushing people to their limits only makes them desperate, not necessarily tell the truth. About the only consistent result of this abuse and torture has been to whip up negative sentiment. This round appears to be about the same.
"...civilian and military intelligence officials, as well as top commanders with access to intelligence reports, now say they learned little about the insurgency from questioning inmates at the prison." - NY Times