While this film has an interesting premise and could have been a really good story, the execution is just so dull, slow and overly- dramatic that it really does suck all the joy and entertainment value out of it.
What's more it takes ages to show the audience what most people will have guessed in the first five minutes. With all the grandstanding and wasted time taken away this really could have just been a solid short rather than a feature film.
Overall it is hard to recommend The Stranger since it doesn't really provide enough entertainment or originality to justify its existence. Only watch if you for some reason enjoy really slow, not- horrorific in any way, horrors that have only the smallest amount of substance to justify their overly-serious tone.