I was a little dissapointed at first that the whole thing is just in that dungeon (hence dungeon crawler i guess haha), but it's actually really conductive to playing a bit here and there. If it were more open ended or didn't have the way points and exit to title saving I might have not kept playing. Are most ARPGs like that to some extent?
Did you ever play any Korean (or I guess any) MMOs lol? If you liked grinding i'd imagine you would enjoy them.
Older ones yes, diablo 1 is just that, 16 levels of going down the dungeon, 4 levels of normal cathedral dungeon, then dirt floor dungeon (T0t4l ch4nG oF sc3NeRy1!1!!), and it gradually gets more hellish and then back to dark cathedral sorta.
D2/D3/PoE/TQ (and TL2 from what I hear) diversify that by changing up the environments substantially, usually by having 'Acts' to split up the visual/thematic style of the game.
I can't stand MMOs because I don't find the grinding remotely fun like i do in ARPGs.
I tried WoW on a friends private server with basically 1-3 other people and that was boring as shit (but isnt a fair representation of what WoW would be like I guess)
I tried TERA as well but the grind was just awful and I gave it away pretty quickly.
No Korean ones though, I've heard they're insanely popular over there though, far more than Starcraft even which makes me a bit sad I must admit.