Well I was just trying the P-51D Online, and I got my ass handed to me. Without a doubt I cannot fly it. It has got to be the worst plane to fly outside the smaller and lighter MC202 which according to what I've read and been told by my Grandfather, does not handle like it should either.
I flew it as high as possible, and still against the other planes I had problems. I went up against a MKIX Spit in Simulator, and he chewed me up. I even went up against a Me109E, just to see, and I got my ass handed to me.
Bottom line, the P51D needs some SERIOUS looking over, and overhaul. My friends grandfather who flew P51Ds and other variants in WW2 and Korea, even said that the plane handled terrible. He didn't play it, but my friend called me and showed it to his grandfather, and he (grandfather) was outraged.
I like the P51D a lot, I mean it was one of my favorite American fighters of WW2 in Europe. But with the way it handles, it doesn't work like it should. I say a total overhaul is in order

Not really, but it does need some serious fixing.