This is a casual game for busy people. The main objective of the game is to fight the monsters in the turf and acquire items that can be used to reinforce the player's character. It must be remembered that this is not intended to entertain hours and hours. It's meant for casual players who want to take a moment from the stress of everyday life to kill some monsters and earn some loot.
Players who don't like casual games probably won't like it. The fight is very repetitive and RNG-based, so it doesn't provide much of a challenge.
But for those who don't think of themselves as "gamers," it can provide enough of a momentary distraction that allows it to be fun in otherwise boring situations.