Bazile...I have found the following on the Wiki entry for the Dambusters raid.
"After the operation Barnes Wallis wrote, "I feel a blow has been struck at Germany from which she cannot recover for several years", but on closer inspection, Operation Chastise did not have the military effect that was at the time believed. By 27 June, full water output was restored, thanks to an emergency pumping scheme inaugurated the previous year, and the electricity grid was again producing power at full capacity. The raid proved to be costly in lives (more than half the lives lost belonging to Allied POWs and forced-labourers), but was no more than a minor inconvenience to the Ruhr's industrial output. The value of the bombing can perhaps best be seen as a very real boost to British morale."
So, perhaps not quite the success that was planned, but that doesn't take anything away from all the people involved, especially all the men that were lost on the mission.