From about 1941 to 1944, it was the only competetive single engine fighter for high altitudes the RAF had - and took many of the most important
PR photographs of the European war, as
P
pbehn states above.
(Finding the V-2 missile at Peenemunde, getting a good low-level image of the German Freya radar, and finding the Bismark in Norway, all images
below captured by PR spitfires)
Answer (1 of 8): From an article about Spitfire pilots, by John Bendixsen (( hope I am honoring him by reproducing it here, not abusing him—not marked as copyright). The PRU (Photo Reconnaissance Unit) Spitfures were likely the highest flying and highest performance photo-reconnaissance aircraft ...
www.quora.com
By 1941 the Hurricane was at the end of its development potential (even the British thought this at the time) and it wasnt until 1944
that two-stage Mustangs became fully operational. Without it, there would have been a very serious problem for about three years.
Of course it is over-rated, but, only because it has been elevated to a virtually god-like mythical realm, which no aircraft can justifiably reside in
from an objective perspective of its real performance. Even if you subtract that, you`re still left with an essential, and irreplacable machine for the war effort.