Just been reading through the Wiki page on the P-38 (I know, I know). However, it raised a number of questions, and like a lot of history, what we think we know is actually a gross simplification of a much more complex story - which could have developed differently.
http://en.wikipedia.org/wiki/P-38_Lightning
Or:
http://www.vectorsite.net/avp38.html
There's a couple of easy ones for our P-38 experts here.

I look forward to being eddicated, but be careful - I'll be looking for weak arguments, too...
Have a look at the page (or your preferred P-38 ref(s) - feel free to mention them) FIRST, then consider and discuss:
1a. Was it a failure by the USAAF training structure to enable pilots to get the best of of the aircraft early on? 1b. Or was it too complex an aircraft for the job?
2. Is there
any real evidence the Germans really called it 'The Fork Tailed Devil'?
3. Were any of the P-38s problems down to it being an unconventional type in looks and thus it was treated with more scepticism than equivalent conventional types?
4. Was it the US that refused the turbos for the British or French, or did the British (and/or French) not want them and ask for them to be taken out?
5a . What was needed to ensure that the P-38 was available for long range escort for the 8th AF from the earliest days? 5b. Could the P-38 have done the job the P-51 did in 1944-5 earlier?
6a. The loss of the 'plane carrying the 'dive flaps' to Europe held up their fitment and left a restriction on operating capability. Was that important? 6b. What (if any) other technical shortcomings were particularly significant in operational terms? 6c. Could they have been 'fixed' earlier?
7. If we accept that dogfighting is a partial failure in air-combat (much better to hit the other guy before he sees you or can retaliate) could different tactics have enabled better results for P-38 units earlier? (Bear in mind that the USN and USAAF learned 'not to dogfight with the Zero' yet mastered the aircraft with better tactics excluding dogfighting - including dive & zoom, an area the P-38 had advantages over any USN type.)
8. Given the different rates of sucess and failure in air combat of the P-38 in the ETO, MTO and PTO, how much do different training and operational cultures (rather than operational differences - climate, enemy etc.) affect achievement in different theatres?
9. Could the range achievements pioneered by Lindbergh in the Pacific have been achieved in the ETO and MTO?
10. Is the P-38 under-rated or over-rated?
I won't be awarding marks,

as I sure don't have 'the answers' but it should be interesting. I've just numbered to questions to make it easier to pick one or two to tackle. Chew as much (or as little) as you like, but don't become incomprehensible!
And
PLEASE don't just repeat the same old semi-mythology, be prepared to support your statements with evidence.
Thanks,