Shoot, I can remember not too long ago that the 109 would lauch from the runway like a rocket - trust me, its alot better now. There are going to be some minor FM changes coming for the 109 in the "Final" 1.2 version that should correct any remaining issues. This "patch" is due sometime in the next few weks. I won't say its going to correct everything, but it will make some things better.
As for the Brewster - it was a wallowing pig in real life - and one of the main reasons why they were sold abroad to foreign air forces. We didn't want them; after all, we had the Curtis Hawk's, P-40's, the P-39's. You won't find too many USAAF units that actually flew the thing. It was however a design that later brought the Navy aircraft like the Wilcat and Dauntless, and other similar aircraft that had mid-wing and fuselage-retractable gear.