Welcome Dan Williams, new LibreOffice Developer focusing on UI/UX - The Document Foundation Blog
(blog.documentfoundation.org)
it works, but it's far from ideal. a lot of features are tucked away behind unintuitive context menus, and on some systems you need to do a bit of configuration for it to look right. for example, it uses bitmap icons by default, so if you use a hidpi screen the icons will look atrocious until you figure out how to switch them to vector icons.
and an ugly UI is a problem by itself. it's uninviting, unwelcoming. it gives a feeling of jank, of amateurism, and not in a good way. if you open the app for the first time and immediately think "this looks like it was last updated in 2003", it's not a good thing.