Depending on your server, and how you install you might have a bad experience. I’ve had issues where it wasn’t finding the film/series metadata, having plugin issues, and being incredibly slow (slow UI when anything is being done, slow scanning folders, slow loading saved metadata, etc). Jellyfin, like a lot of open source software, feels like jank. The devs know about a lot of issues, but they’re swamped with so much, with this big of a project.

People criticise Plex, rightfully so with some of their bad decisions, but it still works better. For me, Plex runs so much better, and without issues. I won’t be moving away to Jellyfin in the foreseeable future, but I’ll be glad when I am able to.