Was his decoding of the enigma essential to the war effort?
Was it the main factor behind the victory of the allies and how significant was it?
hi... sounds like the question is more about the importance of breaking the Enigma Code than Turing personally, yes? There have been several good discussions in here on both, so if you're interested in more search on any/all of Turing, Bletchley, Enigma, Imitation Game. Anyway, let's get started:
a quick intro
what was going on in there anyway
How accurate is 'The Imitation Game'? - follow links to more posts
importance to the war
Did the enigma machine as shown in "The imitation game" really have as large an influence on WWII as the movie shows? - again, note links to other posts - click 'em!
How important was the cracking of the enigma code to the war effort? Is it over/understated?
importance to technology
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Related question: I've seen people here suggest that it's up for debate whether he actually committed suicide. Can someone go into more detail around the circumstances of his death?
Are you asking this because you feel that the media has over blown his status or because you want an AskHistorians answer?