While some aspects ( like heli's ) do take a lot of practice to get the hang of it... I think the "faint of heart" part may be just a bit on the exaggerated side but not by much.
RC cars are likely the easiest to get the hang of once you get used to controlling them from the 3rd person perspective. In fact, that 3rd person perspective is the toughest to get past if you don't have experience with it. When an RC vehicle is going away from you, all of the controls feel pretty normal with left and right controls actually working the way you'd expect but turn it around and head it back towards you... and suddenly everything seems a bit backwards.
With a quad copter ( or other multi rotor )... you have the orientation issue like you would with a car but it adds the 3rd dimension of up and down into the mix. Most of the "flying" is done for you by the flight controller and you basically just tell it what direction you want it to go in. I suspect you still have a little of the "balance" issues seen in a heli but most of this is just handled for you by the controller.
I'm mentioning airplanes ( without a flight controller ) 3rd in the list and just a little tougher to learn. The difficulty level does increase with these but they come in classes from a relatively tame trainer model up to the much tougher 3D and racer's. Of course it still has the orientation issues like the car when it's heading back towards you but also includes the "fun" of when flying inverted ( upside down ) that up becomes down and visa versa.
Helicopters are probably the toughest to learn... with the collective pitch ones being pretty tricky to get a handle on. These are a lot like trying to control where a spinning ball on a piece of glass is going. On the otherhand, the coaxial models aren't much tougher ( and perhaps a little easier ) than an airplane to get familiar with.
Like anything... practice is the key to fewer crashes which is why a sim is suggested to anyone just starting in the hobby. Crashes are inevitable but if you train on a sim enough, you can limit the number of them and more importantly.... not have to constantly buy new parts to repair your craft as often.