Two things still stands out to me,
The F4U-1C still has a better k/d and far more usage than the F4U-4, for a fifth the cost.
The P-40 sees virtually no usage, yet has an astoundingly low ENY to it.
JB73, There is a HUGE difference in plane choice in the real world, and in AH.
In the real world, it's better to survive than it is to get a kill. In AH, it's better to get a kill than it is to survive. AH is biased towards planes which can easily snag a kill or two and die, rather than ones which are tougher to get kills in, but better at keeping one alive.