The Luftwaffe also successfully destroyed more bombers than they lost fighters even attacking from the rear, before the B-17s began being escorted all the way to target. I always understood one the major reasons they started attacking from head-on was to avoid trying to form up under the escorts and have a chance to get at least one good pass in before having to deal with the escorts/dive away.
If buffs could have flown at as high a speed as they do in AHII and if their defensive guns had been as effective, then the USAAF's belief that unescorted bombers could fight their way in and out would have been proven correct, and we would never have heard of the P-51 Mustang.
Keep in mind that perhaps the majority of Luftwaffe pilots shooting at these buffs were *not* as good a shots as you or I, lacking the hundreds of hours of shooting experience AHers have.
Saxman, you say that when you're shooting down the fuselage, you are shooting in a hollow metal tube. Well, no sir, it is not hollow. It is full of crewmen, electrical and fluid lines, and oh yeah, high explosives. Shooting fuselages full of holes to no effect is one of the damage model flaws.
The Luftwaffe found out in WWII that this is the worst possible position to attack bombers from. You'd think after a couple of times of getting ransacked most people in the game would figure this out as well... but alas...