Was the doolittle raid successful

Answer 1

As a significant boost to morale on the home front after the first few dispiriting months of the war, as a Propaganda event to crow about, yes.

As a militarily effective strike on the resources of the enemy, no. Damage was slight, scattered, quickly repaired. It might have given difficulties sleeping to Japanese civilians, who worried that more was to come. It gave impetus to the Japanese military to improve anti-aircraft defenses, which would cost later American raiders.

None of the aircraft returned, or were ever used again. Few of the crews were killed, but they went through epic tribulations to be returned to Allied territory from war torn China.