You heard incorrectly. The U.S. plane with the highest k/d ratio of the war was the F6F Hellcat. And the Jug probably did more to kill the Luftwaffe in the ETO than the P-51. This does not mean that the Hellcat or Jug were "better" than the P-51 necessarily, but that is how it played out factually.
Every plane and pilot made a surprise attack from altitude when it could be done. But it could not always be done. Familiar with Clarence "Bud" Anderson's most famous account of a dogfight?
This is true. However, the 109 pilot Anderson out-turned and out-climbed in his P-51B@~30K altitude per the above-mentioned account was *not* an inexperienced dogfighter, but the opposite. Anderson credited his plane's performance for the victory.
maybe i should have been clearer. The P51 accounted for more enemy kills than any other single allied aircraft (not k/d), possibly due to the fact that as it became more mass produced the skill level of the enemy was waning. Obvioussly there were still skilled luftwaffe pilots around till after the war, Galland, hartmann and others. and yes a super bird will give an advantage to a lesser skilled pilot. even in aces high spixteens are a nuisance. But all else being equal or at least close, the skill wins. more on 109 vs P51B this time
While flying "top cover", Hartmann attacked a flight of four P-51s over Bucharest, Romania, downing two, while the other two P-51s fell victim to his fellow pilots. On 1 June 1944, Hartmann shot down four P-51s in a single mission over the Ploieşti oil fields. Later that month, during his fifth combat with American pilots, he shot down two more P-51s before being forced to bail out, when eight other P-51s ran his Messerschmitt out of fuel. During the intense manoeuvring, Hartmann managed to line up one of the P-51s at close range, but heard only a "clank" when he fired, as he had run out of ammunition. While he was hanging in his parachute, the P-51s circled above him, and Hartmann wondered if they would take this opportunity to kill him. One of the P-51Bs flown by Lt. Robert J. Goebel of the 308th Squadron, 31st Fighter Group, broke away and headed straight for him. Goebel was making a camera pass to record the bailout and banked away from him only at the last moment, waving at Hartmann as he went by.