my experience with it was also kind of a rollercoaster, but libreELEC on x64 harware with some basic IGPU was the key for me.
I tried it on Raspberry Pis (OG and 3) but that surely was painful.
since using a nornal PC, I really have no issues with compatibility, even the most obscure, sonewhat recently updated plugins work no problem.
but I can feel you, it needed several chances from me too, but I needed to replace my PS3 (uaing Movian - what an amazing piece of software!) cause it had issues with some recent fullhd files.