The Witcher 2 is more of an RPG than most out there these days - particularly in the sense that you can actually make an impact with your choices, and the choices you make are far more than a mere illusion unlike most RPGs. Isn't the ability to "play a role" the central element of a "role-playing game?"
The QTE's are annoying but hardly intrusive (meaning they barely pop up and all but disappear early in the game), the combat is engaging and enjoyable, character development is important and leads to a decent amount of customization and feeling of progression, the setting is fantastically implemented, the majority of the characters are memorable, dialogue is well-written with a healthy amount of meaningful choices…I don't really know what else one would want from an RPG, quite frankly.