I believe it should in fact be possible to rate the value of a given plane in game objectively. The following is a first draft of a grading system, weighted for MA conditions, that would be useful for objective ENY/perk value assignment purposes, when perfected.
1.Top speed@SL*3
2.Top speed@5K*3
3.Top speed@10K*2.5
4.Top speed@15K*1.5
5.Top speed @20K*1
6.Climb rate@SL*3
7.Climb rate@5K*3
8.Climb rate@10K*2.5
9.Climb rate@15K*1.5
10.Climb rate@20K*1
12. Max alt gained in zoom climb from 350mph start @5K,*4
13.-(minimum turn circle, no flaps*4)
14.-(minimum turn circle, 1 notch*4)
15.-(minimum turn circle, full flaps*4)
16.Roll rate 150mph, DPS
17.Roll rate 250mph, DPS
18.Roll rate 350mph, DPS
19.Roll rate 450mph, DPS
20.Lethality primary weapon 1 sec burst*2
21.Lethality secondary weapon 1 sec burst*2
22.Firing time primary weapon*4
23.Firing time secondary weapon*4
24.Ordinance load, lbs,*2
23.Flight time full internal*4
24.Flight time fulll internal+drops*4
25-(compression mach*4)