Definitely worth watching. It's an excellent overview at the "big picture" level. Covers politics, home front, effects on civilians as much as the military angle. Narration and scripting are excellent (hey, it's Larry Olivier, so what do you expect).
The only thing is it's a little dated -- maybe 30 years -- and historical knowledge has advanced a lot since then. Some areas aren't covered at all e.g., Enigma and other Bletchley Park stuff, while others are somewhat glossed over, like Stalin.
Still eminently watchable and very informative.
Ethan
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Das also war des Pudels Kern! -- Goethe