Upon popping a piece of the bar into my mouth, the first word that came into my head to describe the flavor was "fascinating!" The chocolate taste came first, followed immediately and quite strongly by the cardamom. The cinnamon flavor was much more subtle, and I didn't taste the hazelnut until enough of the chocolate shell had melted away to bring out the ganache. Incredibly dense and complex flavor. I'm not sure I could say whether I liked it, but it was quite a taste experience, definitely worth trying.
I also picked up a bag of raspberry Lindor balls, and no ambivalence there. Yum.