You've just had the wrong 2-channel plane. I've flown 2-channel for over 30 years (and some single channel -rudder only). They fly as good as any other plane - the only difference is you generally have to fly the fuel out of them. Look at what I posted in your other thread. Some of the best flying planes I've had have been 2-channel (not to mention most of the gliders I've had - rudder/elevator and occasionally spoilers).

Hogfllyer