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You can change the UI design to whatever you want with a custom CSS. Can make your own or there’s a plethora of themes on GitHub. I remember trying one that replicated the Netflix app, and don’t hold me to it but I think I saw a Plex one as well.
Also, regarding the metadata, there are options that auto populate it for you. Idk how it does it, but my haphazard library of torrents all had accurate metadata AND it downloaded the subtitle files as well.
Sorry, I misread. What is bad about the UX exactly? You don’t need to customize anything if you don’t want to; “it just works”. And I dont follow you on how having the option to customize things makes it a bad user experience. You’re assuming the native UI is bad for some reason.
I’ve used Plex a lot too back in the day but there’s nothing it provides that Jellyfin doesn’t do out of the box + self-hosted + for free.