In my opinion (and this is not inviting an argument) the P40 was the 'worst' of the American fighters.
Probably not. The P-40 is probably better than the Buffalo, for example. And the F4F-3. And it seems to do better than the P-39 and cousins in many situations - historically speaking. Also, IF you had to actually fight in something of the period, you probably might prefer it to a P-38, except if you needed range. The P-38 is the best scoring fighter in the Pacific theater, but it is not because it is a better fighter in purely terms of dogfighting. They learned how to use it without dogfighting.
