
I had more fun than the law allows flying only spits last tour. Surviving in a spit IX, in my opinion, is a lot more difficult than surviving in a P-51 because the Spit isnt as fast as it, and many times in a situation where the pony will be able to safely run away, the spit has to fight its way out of trouble. 
<----Spit 9 dweeb 
You must realize though, in a game, unlike in real life, the fun and ease of killing in a plane is as important as the ability to disengage at will. Get shot down by a gang after you take down that fifth bandit, you just re-up do it again next sortie. Repeat ad infinitum. This explains how such planes as the HurriIIC continue to be used in the LW MA.
Tangentially related to this point, remember that fighter is not just scored on k/d...it is also scored on kills/sorties, kills/time, and hit%.