Coming from a web UI design background, a nice clean UI is always super appealing to me, but only when it fits. I’m a big fan of the Destiny UI, because it feels like a perfect fit for the overarching aesthetic; Unlike most Ubisoft games, which just lack any personality whatsoever. Although I must say the left-stick cursor, although visually appealing, does become tedious after a while.
It really comes down to what’s stylistically appropriate, I’m very fond of traditional fantasy RPG UIs, such as in Grim Dawn or Path of Exile/Pillars of Eternity. Unfortunately, sometimes these get a bit carried away with style over usability, becoming an unwieldy mess. UX is just as important for a game as it is in any other piece of interactive design.
Although saying that, what makes for good UX isn’t always the same. I love Hyperlight Drifter’s UI, however most of if it is not immediately clear - the map system in particular is pretty baffling to begin with, but it encourages you to think and interact more with the game.
I believe I’m just rambling now. I might have a think on this and come back if I think of any great examples.