I do not disagree, there are horrible free projects with actively user-hostile documentation out there. But jellyfin is not that. Most criticism of it that I have heard falls either under a matter of taste ("I would do it differently"), a specific hardware setup not being supported or a skill issue during the installation which has more to do with administration of networks and Linux servers than with jellyfin.

And as a user of jellyfin myself I don't think these are particularly fair points of criticism.