I saw the film *spoilers*
I finished just seeing Doppleganger. I really can't say this was that bad of a film. For one it kept my interest, which is really alot to say about a film concerning me. Since I think I have a bit of the ADD.
I think the gore at the end was overdone, but you rarely see overdone obnoxious crazy gore in horror films these days, seeing as how strict the MPAA has become. However where the one demon version of Drew Berrymore's character kisses the other one, was like..the writers got really drunk and thought it up at the last minute. I mean, to find that even remotely erotic, you have to be pretty high, drunk, or whatever.
I think the ending of the film was pretty straightfoward symbolism. I think Drew's dad in the film was completely nuts. Although through most of the film, I thought I'd find out that Drew's dad was Satan. Well he's pretty close to Satan. The whole weird abuse thing where he tries to strangle Drew with the belt was just weird.
So the storyline did leave alot of questions unanswered, but heck, what would you expect of a movie that at the last minute brings out the obnoxious Hellraiserian gore. Those movies tend to not have the most intelligent of plots.