The "gathering mini-game" in and of itself isnt exactly exciting, but to imply that noone would find the DOL classes entertaining is insulting.
I enjoy mining when it's early in the morning and im not in the mood for combat. It allows me to make some progress (gathering supplies for crafting grinds) while not requiring 100% of my attention. Also, the miner's rank 20 class quest was fantastic. (those twins are great)
Honestly, if they add a few survival skills to our moveset i could really grow to enjoy the sense of danger as well.

There are players who enjoy playing the DOL classes, trocien, myself included