Thanks for the replies.
I have no expertise to make a claim that it's over modeled, however the success in which it can be used here tends to make it an overpowering addition to an early pac set up like Midway, at least compared to the way it and it's pilots performed there.
So is it safe to say that the Finnish model was more maneuverable than the USMC F2A3 plus the Finnish airforce just used it more effectively against less maneuverable planes than the Japanese fighters, and perhaps this other factor?
"While the remarkable Finnish accomplishments in the Buffalo are undeniable, aviation historian Dan Ford points out that Stalin's purges and recent expansion of the Soviet Air Force resulted in many new inexperienced pilots while simultaneously discouraging combat initiative. The result was pilots who failed to scan the airspace behind them, and also Soviet air formations that held their positions in defensive circles while the diving Finnish pilots picked them off one-by-one. The Soviet fighter aircraft used in the early years on the Finnish front also included some obsolescent models such as the Polikarpov I-15 and I-153. After the end of hostilities, Karhunen, the captain and commander of the 3rd flight of LeLv 24, recalled:
"The Brewster model 239 was good against the older Russian fighters, Polikarpov I-153 Chaika (Gull) and I-16. Hence the period 1941–42 was the best time for us. In 1943 it was already significantly more difficult when the Russians began to use their newer fighters against us... Later, with the Yaks, Hurricanes, Tomahawks, LaGG-3 and MiGs, it became a fight to the death."