UI looks really nice, and having control over natures will save competitive battlers a ton of time, which I think is a good thing. There's less pride that comes with finally catching the right Pokemon with the right nature, but I think it's a fair trade. People's time is more important lol. The XP candies are kinda dumb, I never used to use rare candies because it felt cheap. The fact that you can have an XL candy that will give a level 50 Pokemon 3 levels is kind of absurd. And the egg moves transfering between species is fine. Being able to access boxes from anywhere is a great QOL change and I'm all for it.
Overall pretty excited for the games still. I just wish I could turn off exp share. >:(