I'm not saying everyone has to like this movie, but if you thought it was tedious, boring and slow, you obviously missed the point. This film is a masterpiece, based on a masterpiece novel by a master storyteller, who didn't need explosions and chases and fight scenes to keep a story interesting, and doesn't have it's characters borderline breaking the fourth wall just to tell a brain-dead audience what is going on. Watching Tinker Tailor required a lot of concentration, for me at least, and that's what I loved, wracking my brain to try and work out the fine details, which is why I understand a lot of people wouldn't enjoy it, because they'd rather sit back and relax and switch the old noggin off. in my opinion though, the best film is a film that challenges you, doesn't hand you everything on a silver platter, and doesn't stick with the grossly overused Hollywood formula and cliches. That is why I choose to rate this film so high, as well as the absolutely wonderful acting by some of the UK's best, where looks, expressions and gestures mean just as much as words themselves. The cinematography and music also top the film off nicely, with the film-grain look being quite prominent and the minimal, held-back music. Absolute 70s magic