The OA isn't for everyone. I loved it and thought the first season was thrilling. It reminds me of the leftovers, not because of any common tone or theme, but because it's a show people either love or really don't like.
If you want to see slow paced, Sense8 takes the biscuit. I count about 10 minutes of actual plot over the entire season, primarily concentrated in the first and last episodes. It's obviously meant to be a character-driven story, but each of the characters is a two-dimensional stereotype.