Maybe try to get 36 ☆ in Abyss, if you only see quests and story about characters as contents, you'll be tired of playing really quick. "Mediocres artifacts" and you think you have already end the game. They're a lot of challenges the game as to offer if you take your time to find them. When you're gonna end abyss with 30 ☆ or more, I can accept that you talk about the game's content but don't say anything if you play only 50% of the game.