I've tried watching this show for a long time, and even though I really liked it, for some reason or another the furthest I got to after restarting it a couple of times was season 4.
This time, I started watching it again with my partner and discovered a whole new appreciation for it. Since I already knew the story, I was able to focus more on the characters and some other details.
The writing really is remarkable, everything is well thought out. With most shows, I get to a point where I lose the immersion because of sloppy writing, but with BCS, I found myself fully immersed in the story and emotionally invested in the characters. There is always a plausible explanation for what happens on the screen.
The ending was brilliant. That last scene where the camera pans in front of the corner of the building until you can't see Jimmy's face anymore had a big impact on me. It felt like melancholic acceptance? Or at least that's what I think Jimmy was feeling, and that mood stayed with me hours after the episode ended.
I thought BrBa was amazing, but BCS surpassed it.
I'm going to be so mad if this show ends up being another Lost. They keep introducing more and more "mysteries", and not really solving or explaining anything.