Got done watching all the animated series not long ago (JL+JLU being my favs). Recently started a trek through the movies, most of which I've never seen. Going at these more randomly than I intended, just whenever and whichever I'm in the mood for. Tonight I was just about to try out Justice League Dark before stumbling upon this thread, lol.
Marvel's mostly got their cinematic universe on lock, but can't touch DC's animated stuff.
There's actually a little continuity in a chunk of the post Flashpoint stuff. Each movie still stands on its own, though.