I still say it all depends on the individual student and the instructor.
A guy I work with (I think he's 19) was flying nice level rectangles with my Magic 3D,
after only two rounds around the field where I sort of nudged him along.
Yes, we were at about 1/4 throttle, and yes, I set up the low rates for him.
Midway through the tank, he was confident enough to change to figure eights.
We had started off with me having him watch my sticks as I flew slow circuits,
and explaining how little you actually had to move the sticks to attain results,
along with the basics on how to keep level through a turn, and all that.
He's flown all the fighter games and sim games, but had never tried an RC,
or even an RC sim. He just picked up on it very quickly. Good enough
so that I was confident to lean back in a chair and just watch and coach until it died.
He's the sort of guy who would probably solo in only a couple weekend's work.
Very smooth on the sticks, in a very short time... AND... he follows directions perfectly.
I figure, if a person is level-headed, remains calm, and isn't one to go nutso
with the controls, when something starts to look "wrong", I could train them
on most any of the popular Sunday fliers out there today. Even without a B-box.
Then there are those who are just plain hard to train... even with a Kadet