Congrats Mus, you with started a good question and have received good answers. Too often this is not the case in these forums.
I have to agree with almost everything I've read. The P51 was a great escort fighter, but head to head with experienced Luftwaffe pilots would not have been a legend. Also, the victor does write the history, and we only heard half of the victors side after the war because of the Cold War, so we (Americans) are missing a great deal of the history of WWII. BoB and what the Russians did in in the East should not be slighted or forgotten.
IMHO (where I always get in trouble) The P51D did may things well and nothing great. That hurts it in AH where we have no fuel or reliability issues and an unlimited number of aircraft.