The reviews for this movie have been rather consistently poor--both when it was released and on IMDb. For some reason, I actually liked this film--maybe I have bad taste, but I found it to be a very pleasant surprise! Maybe some of my positive regard for this is because I like George C. Scott so much and because I like paranoid and depressing movies (and this one has all these elements). In fact, I am guessing that the depressing nature of the film is much of the reason why others dislike it (there are a lot of murders in the movie). But I liked it for the odd plot--about the evil oil producers trying to suppress a secret for a cheaper fuel through murders and payoffs. But, if you do decide to watch this film, please try to remember that it's only a film. This is not a piece of non-fiction!
UPDATE--8/08. I re-watched this film (something I rarely do) and was surprised how dull I found it a second time. While I still liked the paranoid plot involving a worldwide oil conspiracy, this time I noticed that the film was a bit too talky and the plot a bit too convoluted. Plus, and I know Brando fans will hate me for saying this, but his acting seemed a tad over-done. Still, it's a decent film even if I did knock my original score from 8 to 6.