Doppleganger is a smart film and I think that people are selling it short by looking at the negatives like "lack of CG FX". Money doesn't make the best films. If you're looking for only horror films, this may not be for you, but to slander Doppleganger for bad marketing, too, is not the film's fault. Not every Asia Extreme film is going to be a horror-masterpiece. There has to be room for flexibility within the genres and this movie is one of those. It's a thriller, without the blood. You can't blame the film for that. And judging a movie by the box is just plain dumb. With that aside, yes, I did pop in the DVD assuming it would be horror, but the film impressed me nonetheless. It's actually more of a sci-fi psychological thriller. It reminded me of the cult classic 80's films like 'The Reanimator' except without the same "gore/slasher" aspects. To begin with the acting is amazing, but that's not even the best part. The director is really on top of his game.
What's amazing about these Asian directors like Kurosawa is that they're more versed in american cinema than the idiots directing for the big american studios these days. If you look at the way the story unfolds, and the movement of the camera, and music choice, not to mention the awesome split screen (which I thought was really advantageous to this movie) you can tell that Kurosawa has to have seen some classic DePalma movies like "Blowout" and "Body Double" (Blowout, 1980 -- Tarantino loved it...and was the reason he used Travolta in Pulp Fiction). It's also feels like there's a shadow of Cronenberg as well, and those robots look like "Johnny 5" from Short Circuit.
What you have to understand is that this film is looking at the idea of the doppleganger as a metaphor. A lot of people have trouble understanding the fact that these types of movies are psychological and often contain the unexplainable. Like in fight club with Brad Pitt's character, the doppleganger is not really real. He exercises control over Hayasaki because Hayasaki lacks the will to believe in himself and his science.
The movie really dissects the idea of what it means that we have a 'will' in the first place. That's what's going on in the 2nd scene where they're trying to adjust the controls. The intern kid is a weak person, without a strong will and he cannot control the robot device. The movie is ultimately about control. And Hayasaki's lack of control is what creates the doppleganger in the first place. The ending isn't really that ambiguous, either. I don't know why anyone would think it's ambiguous. I won't spoil it, though.
Anyway, here's the point. If you like psychological thrillers, you're a fan of cult psychological thrillers and science films, and you want to see a movie that is totally engaging, has some cool robot scenes and a solid plot, Doppleganger is a great film.