Currently Cube World only really has its aesthetics going for it, the voxel based graphics are quite impressive and kinda makes me wish Minecraft was based on this. I've managed to find a few items that hint towards eventual house building, and it would be fun to see a city slowly develop.
The world is what impresses me the most though. I dont know how randomly it is generated, but its so smooth! No weird glitches in the map like you see in Minecraft, and I absolutely love how there's always something to do in the vicinity, be it a boss or a dungeon. Crafting system is also far more straight forward than in Minecraft, where if you dont have a wiki page at the ready, you're pretty much bumbling in the dark. Here it clearly shows you what you need in order to craft the item you want.
In an ideal world, the creativity of Minecraft and the RPG elements of Cube World would be combined to create the ultimate game.
Oh, one HUGE ass plus, is that your character is persistent between worlds. Meaning you can keep using that same character, with all the gear you found/crafted, on any server you want.