It pretty much do. A Brewster has the same ENY as Moss 6, 109F and La-5. Brewster have a k/D of 0,82 and the 152 has 1,76. Its a huge difference . The I-16 has ENY 40 and it can do most thing the Brewster can + it has cannons so the ENY 30 seem rather appropriate for the Brew. A Brewster w cannons would have been a ENY 20 plane, similar to A6m5 and hurri 2c.
it can turn well yes but lacks ground attack capability and have short clips for the nose guns and that effect the ENY as well.