Nice to see that some people have actually moved from BOP to Il-2, the movement has been, I think, mainly the opposite mostly!
The P-38 is a real killer in the pacific front, being faster than anything the Japs have, except Ki-84 and J2M, that are, in realistic scenarios, limited to Home island defense mostly.
P-38 is not so good against its Luftwaffe opponents, remember that every 109 WILL give you hard time in a dogfight, as do 190s. USAAF, having early on nothing better, just had to stick with the P-38, before P-51 and P-47s with multiple droptanks. Remember that you are faster or as fast as 109s, so you dont usually have to fight them if they cant dive to you. But remember that rocket and bomb racks slow you down...
If you can get a 190 slow down, you can fight and win one, however online the 190 pilots often tend to know their machine inside out, and might still come on top. Dont let them use their superior roll and kill you early.
And as with every aircraft, never be alone, work together, attack from advantage only and fear the death, and you shall become fearsome!