I think HBO's 5-part miniseries "Chernobyl" is an absolute masterpiece. I found every second of all five episodes completely riveting. The series is historical storytelling at its finest, recounting the 1986 nuclear meltdown, with the finest cast, CG, fact-checking, and soundtrack.
IMHO it deserves to be IMDB's top rated TV show, and I hope it stays at the top for a while.
Who's watched it? What did you like and what didn't you?