I cannot believe that I would have watched this three years ago. I watched so many films and dramas, and nothing has lived up to 2521 in terms of emotional resonance and inherent artistic value. I will never understand the hate on this show no matter what, and I will always love it for the emotions I processed watching it. Edit: Spoiler tag because I felt this would be too long to read!
I FINALLY watched it. I thought it was entertaining throughout, but it switches genres in the last half. I'm not sure how I would rate it, but I think the tragic ending made sense.