I like the exploration part, but as soon as you have explored everything, it's just all about boringly killing monsters in order to get upgrade material for your characters, and as you get more characters (which you will want for more interesting experience), the more repetative and thus boring it gets. The process of getting upgrade materials is slow, as the rewards are low. So the game pushes you to spend $$$. Inbetween all that the game inserts short-lived scenarios that do not last long.