It was a deadly bird, what with those guns clustered right in front of the pilot. That made for effective long-range gunnery, as enemies like Yamamoto found out.
The P-38 was a gorgeous airplane to boot.
http://www.bongheritagecenter.org/
Bong made 80% of the reputation of the P-38.
In his hands , a P-38 was just about the most deadly aerial gunnery platform in the history of military aviation.
Not the funnest plane to bail out of, I have read. The tail bar caught ejecting pilots, apparently.