I think the distinct lack of enemy diversity is what kills it for me. Even the boss designs are overall lackluster. A bunch of cubes casting spells, or an ice/fire flower. I go to challenge this water goddess thing and instead I fight water squirrels and crabs. That and I can only kill about four bosses a day for rewards.
First going in I thought I would be playing with friends and fighting bosses. Now I've been told not to do that because you don't want friends stealing your chests. Maybe I'm doing things wrong.
Enemy diversity is just part of another big issue for me: General gameplay diversity. Most of the stuff the game has you do outside of story content is just fighting the same enemies or boss types. There's no unique dungeons or bosses, the "domains" you need to farm for gear are all just waves of enemies, daily quests are just killing enemies, etc. There's rarely any unique mechanics or novel ideas that actually change the way you play, which makes the game get stale fast.
First going in I thought I would be playing with friends and fighting bosses. Now I've been told not to do that because you don't want friends stealing your chests. Maybe I'm doing things wrong.