The worst.
Ugh.
I REALLY hate poor UI and menus in RPG's. I spend a shit ton of time in menus, I always want a quick and snappy UI that lets me do things relatively quick instead of getting buried within sub menus and more sub menus.
Anyway, no doubt after spending hours with it I'll become accustomed but the videos don't look encouraging imo.
Menu and UI is kind of fine on a controller, it's a pain on PC with a mouse because the buttons are huge which also means only part of the options menu gets displayed and you have to scroll to see the rest. Lots and lots of tabs though. Basically navigating the menu with a controller is generally much quicker and reliable than mouse because it's a menu made for controllers.
The biggest UI issue for me is the galaxy map, it's just slow and shit because they actually do an animation for going from planet to planet or cluster to cluster and it takes an awful lot of time.
Thankfully I'll be playing on PS4 but it sucks for PC guys if the menus are even more cumbersome for you with m/k.
I saw the planet transition thing yesterday as well. It looks really cool but will be annoying by hour 15 watching all this unfold over and over again.
It's basically "browse NeoGaf time" when that happens.