Ok, usually I don't get into "discussions" about a planes worthiness to be in the AHII skies, but I do have to wade into this one.
The reason the Americans and British found the P-39 a dog of a plane, is because of the battle environment they fought in. The Americans and British had to intercept enemy aircraft above the best operating altitude of the P-39. Above 17k it is next to useless, as performance slips into the beyond pathetic range. I have one question to all the nay sayers and "It's going to be a hangar queen." people out there; How many raids have you intercepted above 17K? I can count on one hand (and still have fingers left over) the times I have intercepted a raid over 17k in the last year.
The battle environment we have is more akin to the Russian one. Fights are at low to medium altitude, enemy fields are close. Just read about the Russians use of it. It is not uber fast like the La's, and it turns a little better than a 109-F, so think of it like the Yak-9T(a diamond in the rough that one), but the secondary armament is decent. E retention is good ( a good B&Z'er), and it climbs like a lost angle. (4k per min. from the deck.)
Is it Uber? No, other planes are faster,and others turn tighter.
Does it have a place in the MA? Yes, In the environment we often fight in and a decent stick, this will sing the praises of the "iron dog".