Well, we'd ofcourse need some more early war planes (I-16 Rata, I-153 Chaika) to act as worthy opponents.
While it might not be a hit in the MA, it would still see use in the SEA and AvA. It's been a while since I last flew a sortie in the MA, so I don't really care whether it is available there or only in AvA and SEA.
Brewster was obsolete. In real life you can get kills with a single 7mm MG on any plane. So kills were earned in many obsolete aircraft. In AH it would suck blow and stink all at the same time
A single 7mm? I suggest you go read through this thread to see what the Finnish B-239's had as armament.
(It was 3x12.7mm and the single 7mm - see my post at the top of this page!).
Time for the Brewster?