The 2004 reboot of the ’70s sci-fi series Battlestar Galactica has some pretty major flaws, mostly in the obvious lack of a narrative plan. Creator Ronald D. Moore later admitted in interviews that he and the writers didn't have an overall vision for the series, which led to it spinning off the rails. (Polygon included it in our recent list of TV shows that should have called it quits after one terrific season.) But when the series is good, it's tremendous.
The ensemble cast is stellar. The modern re-imagining of the android Cylons from the original series is daring and weird. And the focus on political strife and splintering factions among the remnants of a mostly destroyed humanity will always feel up-to-the-moment relevant. Then there's the overall aesthetic vibe, particularly the sharp visual design and Bear McCreary's mournful, memorable score.