Are you saying Soviets were better pilots than Brits or you'd like to get into flying characteristic of p39 dear:)?
Soviets used it because there was nothing else at the time.
Heh!

Every nation had some great pilots. (Although in victories, no one comes close to the Germans, of course.)
What I mean is that the P-39, when used below about 15-20k or so, was a decent and effective fighter. It wasn't because they had nothing else. Here are the production numbers of fighters the Soviets had:
Yak-9, 16769
La-5, 9920
I-16, 9004
Yak-1, 8720
Yak-7, 6339
LaGG-3, 6258
La-7, 5753
P-39, 5007 (from US)
Yak-3, 4848
MiG-3, 3120
Hurricane, 2952 (from UK)
P-63, 2421 (from US)
Spitfire, 1331 (from UK)
As you can see, the P-39 is far from the most numerous. They had more Yak's and La's by far than P-39's. So if the P-39 were a horrible fighter, I doubt that you would have seen 3 of the top 5 aces having flown it (#2, 3, and 4 flew P-39's). They all would be Yak and La pilots (or maybe some Spitfire pilots, as the Russians had 1300 of those).
I flew the P-39 quite a bit in AH when it came out. I thought it was a decent plane below about 13k. It isn't the best turner, but it turns reasonably well (better than some), handles wonderfully at speed, and is reasonably fast down low. Not a bad plane at all. I looked back at my scoring in it from 2008-05-01 Late War and see I did 16 kills in it and 6 deaths, and I wasn't flying it in any particularly special way (fighting only when I had 3:1 odds in my favor or something like that).