I dont dislike them, they just need more fine tuning and be more creative with content. (in general)
It shouldn't feel like a slog to run to each check point, dungeon progression needs to be more fluid and faster. I doubt new players can or will enter this dungeon early on, so let veterans have fun for once.
Every check point doesn't have to be filled with trash mobs, it's okay to have some puzzles and riddles. Or add more random events such as visiting gods/kamis that boost you or trick you. (Thinking here about HoH the little minions or minigame events such as the card guess-game from treasure maps)
"Another-criterion" version should be tuned down to midcore difficulty, so even random partyfinder groups can clear it more easily.
Add gear enhancing upgrade materials or anything that really is worth to return to Variant dungeons. It's beyond me why dev's create content, just to let it die after a month.