I was happy to see the Ki-43 added for historical reasons, but I figured that it would not be a very effective plane in the Main Arena because of armament.
I flew it several times tonight, and it seems like a surprisingly nice plane to me. Very nimble in turn and roll, good climb, and seems to handle much better at speed than a Zero. Importantly, the armament, while of course underpowered compared 2 20 mm cannon or to 6 50's, seems good enough for turn-and-burn fights.