From broken playback state tracking, "currently watching" that just won't go away (obvious local state management issues), subtitles that randomly won't show up (no matter what you do), un-configurable +30s/-10s skip options, outright crashes (that toss the local state of whatever you were doing), fun with HDR playback (good luck, 0 handholding. You just have to make all the stars align yourself) and many, many more problems are routine.
Despite all this though, it is (or at least was 9~ months ago, when I made the switch) so much better than Emby (and sorta, by extension, Jellyfin -- which was much worse) on the same platform that it's astounding.
I remember being super impressed that metadata matching was mostly working for a predominantly ASPAC focused library. Library management in general is much better, now that I think about it.