My summary is not meant as harsh criticism--it's just a fact that this film has limited appeal to the average viewer. The average person out there simply doesn't care about terms like 'New Wave' or artistic differences between directors--they just want to be entertained. So, if you just want to be entertained, you'll find this tough going and if you are a cinephile, you'll probably get more out of this.
The film is about the French New Wave movement--and in particular, François Truffaut and Jean-Luc Godard. While there were certainly other New Wave directors (such as Resnais, Rohmer and Chabrol), the film focuses in on these two for several reasons. First, they were among the most vocal and important New Wave directors--sort of like the prophets for the New Wave god. Second, their relationship, over time, changed--going from close friends and guys who respected each other's work to arch-rivals.
The documentary is filled with TONS of clips of New Wave films--not just of the two subjects but most of the New Wave directors (I say 'most' because some, such as Melville, are omitted). For fans of the style, it's a great chance to relive memories of great films. What the film lacks, however, are interviews. While Truffaut died long ago, there certainly are many others who I would like to have heard from but the film instead is just film clips and narration. Because of this, it's all a bit frustrating. It's also a bit frustrating because the break between the two directors seemed a bit vague--as if a bit rushed and not explained adequately. I understood this section a bit better than most (having seen and reviewed a gazillion films), but just thought it could have and should have been more clear. Overall, interesting for some but also a bit short and perhaps lacking depth.