As a racing and car crazy kid growing up in the seventies, I was lucky to get to see this on the big screen when it was released, and it blew me away then. This was the first racing movie that focused on the racing and what it took to drive at that level, and is still the standard against which all other racing movies should be judged.
It's pretty much a fictional "documentary", with virtually no dialogue spoken during the first thity-five minutes. The plot is bare bones minimal, only invloving what the drivers, team managers, spouses, etc. relate to each other in the context of the race. There is no love story, no real subplot, nothing but the purity of the racing.
Because of this, "Le Mans" is nearly perfect. Stunningly shot & choreographed, with amazing and very realistic stunt work and driving, it gives the viewer the ultimate feeling for what it's like to race at speeds over 200 MPH for twenty-four hours.
If you're looking for a plot filled with dialogue, in depth characters or anything which takes away from the racing, then "Le Mans" isn't for you. But if you want a highly accurate albeit fictional look at what international road/endurance racing was like back in the early seventies, then you need to watch this movie.