Krusty you'd land multiple kills in p39 even if it had hub mounted sling shooter. But then again you wont stand a chance with equally skilled opponent in lets say historical enemy of aircobra 109, any model.
First, you don't know me. I'm average at best (to be realistic, below average most times). I'm not a crack shot. I'm not Levi. I don't play for kills or for score. I just play one sortie at a time and try to make it back to base whenever possible.
Second, a P-39D or Q against a 109 is a damn good fight. The P-39 has a VERY small turning radius. Compared to 109s, it's more than a match. The later the mark of 109, the better the P-39 becomes in a turn fight. The earlier the mark of 109, the more even the footing is between the two. The only problem is managing E.
You don't seem to realize the specs of the P-39s... The reason they were "poor" for the brits is the RAF was engaging the LW at alts between 25k and 30k in their fighter sweeps. The reason they were bad for the US Army was because they had no supercharger, and the A6Ms would fly circles around them, at much longer ranges. Same could be said for the F4F, when you think about it (Thatch Weave and teamwork/massive-numbers is the only reason the F4F persevered against the A6M!).
You put it on the Soviet front, and all of a sudden no fights are above the "low alt" band, and you've got 109s/190s being easily out-turned by lighter aircraft. Meanwhile the LW has to build heavier and heavier armament, bogging down their fighters, just for a chance to down IL2s and bombers. That gives the edge more and more to the P-39.
Suck? Maybe. Depends on the context. War-winner? Definitely not. Lethal? Yes.
I don't think you're really compared it to all the planes you claim can wipe the floor with it....
P-39D vs 109E-4 (1940 matchup): Airacobra is 20mph faster up to 16k+, dives at least twice as well, convertes E to nice tight turns, and is no slouch in regards to turning circle.
P-39Q vs 109G-6 (1943 matchup): The P-39Q is almost as fast as the G6 (and matches the G6 at 12k), and almost matches it (pretty close, actually) in climb rate with WEP. And that's WITH the weight-inducing, speed-eating gondolas, fly it "light" like I and many soviet aces of WW2 like to do, and it's even better. It will turn with one really well, and can use the vertical with its powerful WEP settings.
But how about some other comparisons? 39Q v 190a5: 39Q almost matches the speeds of the A5 (a little slower down low, then catches up as the 190 power curve drops), matches the climb rate, and can out-turn it six ways from sunday. A 190A with a 39Q on its butt is dead (unless the 39Q blows all its ammo and has to run away).
Maybe you fly allied planes more, and don't have a frame of reference for them.. Okay them.
P-39D vs Spit1 (1940 colleagues): P-39D without WEP (it has none) is 10mph faster than the 5-minute WEP of a Spit1A. It's firepower is significantly better (if just for the 50cals in the nose, and the 1000rpg for the 30cals, not counting a hispano or a 37mm in the nose!). It's turn rate is not as tight, but it's not like much out-turns a spit1a anyways. P-39D matches the spit non-wep climb rate as well. Handles high speed much better. Only problem is fighting above 15k, which the RAF had to do.
Or a 1943 comparison: P-39Q is a few mph faster than the Spit9 is at all alts up til the 39 drops off. The spit9 drops off just above the P-39, but it has a supercharger which kicks in a few thousand feet above that. Otherwise it'd be in the same boat as the Airacobra. 39Q can give a spit9 a run for its money in a dogfight, but the spit is a tighter turner again (but note, that's not the only thing that determines a winner). Spit9 does have more climbing ability (better engine than spit1) but the 39Q with WEP will break 3400 fpm at low level, not too far behind the spitty's 3600+ fpm.
How about other US planes? P-39Q is 20mph slower than P-38L on the deck but just about matches it at 12k (it catches up) and matches the 38's climb rate. It's about 40mph slower than a P-51B, but matches the climb rate, exceeds the turn rate by a mile, and dives just as well. It's noticably faster than an F6F and out-climbs one too. It outclimbs a D-hog and isn't too far behind one in speed either.
So I'm not a total P-39 fanatic. I enjoy flying it in-game because it's a bit more challenging. I don't have all this stuff memorized (I had to look it up to post this). I just don't like folks trashing a plane on the grounds that it sucks when they don't bother to actually look at the info available and actually fly it.
Curse the gun all you want, but don't blame the plane's performance for not getting any kills in it.