Unfortunately, I'd say that the UX has actually deteriorated in the years I've owned an XBox. As they've tried to push more and more non-game content, access the games has gotten worse.

The other things, like the settings screens, are just as bad as ever.

I wouldn't award Sony's crossbar interface any points either. After a few years (on two systems), I've learned where to go hunt for the 2 or 3 things I usually use... but that's not a complement.

The Wii, despite being sluggish, at least had a UI that made it very quick to launch games. I haven't used a Wii U so I don't know if it's any better. Based on my 3DS, I highly doubt it's objectively "good".