Judging by some of the responses it seems to me people do not understand how the performance of secret services are measured.
A quick history lesson, when the British intelligence services cracked the Enigma code, the British did not intervene with Germany’s war plans, for the simple reason had they done, then the Germans would’ve sussed the code was broken and would’ve changed their communication method.
This is why secret services do not publicise their successes, as such news could alter the plans of the enemies thus making if more difficult for secret services to continue monitoring and protecting citizens.
On the flip side where secret services fails, innocent lives are typically lost, which make the news. Hence the saying - secret services are known for their failures, and not successes.
Lastly, the ISI is one of the most successful secret services in the world, and was voted number 1 for a number of years, for one simple reason – not a single ISI agent has ever defected or released information to the public. Mossad, MI5, MI6, FSA et al have had agents whom have defected and have spilled the beans, the same cannot be said of the ISI.