The difficulty in shooting down other planes will be a result of the player's skill level and abilities, not the plane.
ack-ack
BULLCHIT. Tell me a person isn't going to have a MUCH easier time shooting down an enemy fighter while in a george vs while in a 109F/G or Yak-9U (think single 20mm and dual .50 cals). Sure, the ability to aim properly is key, but the ability to rip apart a plane is another. A Yak-9U/-3 needs a longer time on target because of the lack of RPM's and the lack of volume. Funny that the "aces" in AH are not using the -9U vs the Spit's, P51's, and La7's??? I mean really, the -9U is quite capable except for 1 thing: firepower (it doesn't have it). The Yak-9U (and -3) do not have the "hit hard" capability and they certainly do not have the ability to sustain what firepower they do have for very long.
The plane allows the pilot to do certain things more so than the pilot allows the plane to do certain things, otherwise the spectrum would far more level than it is. Do not fool yourself in to thinking that the single 20mm and dual .50cals with their low ammo count is just as effective as a 190A-5/8 with the quad 20mm's, a Spit 8's dual 20mm's and quad .30 cals, or even the 6/.50's on a US fighter. Unless the Yak is able to saddle up and hang on like a gay man riding a mechanical bull until the target plane has blown all of its E, the Yak is at a distinct disadvantage.