I'm surprised no one has turned this thread into a P38 whine fest.
BigShot; Everyone in here knows the P-38L is my sweetheart. It is a SUPERB plane in AH, but you have to master it first. Once you get used to staying fast all the time, you can even dogfight yaks, ponies, 109s, and in my case, spitfires flown by mediocre pilots.
You can use its acceleration and good vertical performance to your advantage. Today I flew for almost 4 hourse and it seems like the 1ping engine deaths and glass tail are gone. I found myself flying with all my engines leaking black and gray smoke, missing an aileron and a flap, and I was still very much in the fight. A very sturdy plane.
Anyways, you may get frustrated after a while if you choose to fly it as your main ride. I recomend you learn to fly planes like the Yak, the Mustang, the 109 once in a while too.
Good luck and remember to have patience. Fighting in the P38 is more of an art than just plain TnB or BnZ, you really have to work the plane. Watch out for compression and learn to control it, and watch your airspeed.