I agree that a Cub is not a beginners airplane, mainly because of the ground handling. I suspect this is due to the gear being a bit forward. I do not feel it is as bad as described however. IMO it is made worse by a poor setup. Most do not take the time to add the correct amount of right thrust so the airplane will want to veer left on take off. Couple this with too much rudder throw that is there for good turning radius while taxiing but too much for flight and the airplane gets difficult to manage on the take off run. With the correct setup a Cub shouldn't be much more difficult to fly then most tail draggers.