One thing I have noticed from reading reviews and comments about the show is that there is little consensus about which episodes are the best. Many people (I being one of them), actually think episode 2, "Fifteen Million Merits" is the series best.
Personally, I love every episode, and I even think the "The Waldo Moment," which is by far the messiest episode, made some important points about the dangers of bad and lazy criticism.
I'd say some other things but want to refrain from spoiling anything. While I usually hate it when people care too much about spoilers (as you note, a work should still stand up upon re-watch), this show at some points relies on the viewer's lack of knowledge to create a tone/mood/point.
Personally, I love every episode, and I even think the "The Waldo Moment," which is by far the messiest episode, made some important points about the dangers of bad and lazy criticism.
This AV Club review of seasons 1 and 2 (http://www.avclub.com/review/black-mirror-is-a-brilliant-cal...), which contains fewer spoilers than the episodic reviews, really captures the goal and the value of the series as a whole (see: its title.)
I'd say some other things but want to refrain from spoiling anything. While I usually hate it when people care too much about spoilers (as you note, a work should still stand up upon re-watch), this show at some points relies on the viewer's lack of knowledge to create a tone/mood/point.
EDIT: Grammar.