It was crazy smooth for me. TMDB stuff just worked. Movies, TV, extras organization just worked. Apple TV, Roku, and iOS devices as clients just worked. The Apple TV client isn't great, but they're rewriting a big chunk of it now.
It doesn't do the sharing scenario that people are solving with Plex, but for my purposes it has been perfect.
I think a lot of people are doing stuff that's well beyond what I use it for. I just have my blurays and dvds on there, so it's possible I don't know I'm missing some important stuff that other people need.
This sort of underscores the ancestor's complaint: It's not exactly dead simple to set up and understand, the community recommends third-party apps that have only partial support, etc.