Palace of the Dead/Heaven-on-High.

Maps are fun enough, but the RNG can feel penalizing (vs. something that works with you). PotD/HoH is actually fairly engaging content, useful for leveling if that's your thing, and until Blue Mage came out a couple of months ago, the only solo content in the game.

Maps are just sort of there, and people never want to do free-for-all, so basically 7 people put in hard work for 1 person to get a trout ton of rare items to use or sell. And then 1 person gets nothing because it wasn't "their" map, even though it really shouldn't matter whose map it is, because the only thing that defines it as someone's map is that they happened to have it. Maps are not even hard to procure, so it's not like it's this super hard to get thing, and people just come along for the ride.

tl;dr PotD is dope af, maps are smurfing stupid