Just watched "The Unbelievers" a 2013 film documentary following Richard Dawkins and Lawrence Krauss about at various speaking events (its on Netflix). It had a few interesting moments but was largely pointless. It would have been better to have watched or listened to just one of the Dawkins/Krauss discussions in full than to have watched this series of clips. Indeed, given that I did listen to one of those shows in its entirety, it was more interesting than the film.
But this film has lots of short snippets of other celebrity atheists (Woody Allen, Cameron Diaz, Ricky Gervais, etc.) at the beginning and end, so maybe that makes all the difference.
Does this film make a compelling case for non-belief? No.
Does it even give a coherent scientific message? No.
The entire point of this film is to say "look, there are lots of atheists out there and some of them are very clever and very popular" to the intended audience, which I guess is mostly American atheists. I guess the film makers hope that some believers (of whatever flavour) will watch it too.
Not sure that was 80 minutes well spent though. If I was you I wouldn't bother. Watch a full debate between a theist and an atheist on YouTube, you'll probably learn more.