Most of the USAAF pilots who started out on it and later became aces said that it was a great plane to fly, but they wouldn't have wanted to go to war in it.
Some USAAF groups had moderate success with it, mainly over New Guinea (like the 8th FG), but on the whole it didn't fit the American style of combat.
I REALLY hope to see it though, both for the early war setup in the Pacific and for use by the Russians. Had it in WB, was great low level fighter and ground pounder. Could pull some nasty tricks once you got the hang of it, and that armament package is lethal when you don't have jamming modelled.