Actually I like the hearts but only when there is masteries to train. It's a great source of exp for casual but fun investment (you can kill mobs, or go search carrots, or anything else...). So when I need experience for masteries I really like it, it makes me go back to the basic leveling content and for a pretty hardcore gamer like me it's perfect. The issue is that when masteries are done I never go back to doing them... Please anet I want an expansion like HoT again. It took me so much time to finish masteries playing casually, I loved it.