I left some typos, but it's fine. I also have some experience with designing UI, but obviously nothing that's close to triple A project worth millions of dollars. If UI is horrible or not good then people will complain and talk about it, if UI is good then no one will talk about it, and if UI is perfect, then you might get some praise, but still not many people will care or really talk about how good it is. That's how you know if you made a good UI. Because a good one, just works. For example, I know what I want it to be like, but I can't figure out the right combination of settings to make my crouch/dive/slide how I want it to be.
