I'll start. Did you know you can run a headless version of JD2 on a raspberry pi? It's not the greatest thing in the world, but sometimes its nice to throw a bunch of links in there and go to sleep.
That's fair, never used Plex but I suppose it's more polished being a product and all. In my case, I read Plex requires an internet connection to work and I needed my media server to be available offline, so it was a deal-breaker