It must have been too deep and possibly philosophical for the idiots who wanted to put a simple tag on it for one specific genre and then have the movie follow the genre's paradigm. But, it you would like to think about the psychological nature of reality and delusions and hallucinations; intrapersonal truth and dishonesty and how it aligns with interpersonal truth and dishonesty; then you will like this movie.
Many reviewers said Jacob's Ladder was bad when it came out. But, these are the same types of people who acclaim Michael Bay and Jerry Brockheimer films and think European cinema is something movie reviewers don't watch unless they live in Europe. I am Swedish and have found that the best way to find good English language films is to completely ignore American movie critics' opinions. So please, disregard most of what you read here. But, take what i say to heart.
It is worth watching.
Firth plays Ben a man that has been involved in a car crash that has killed his wife and as he has just awoken from a coma he begins to seek answers to what happened.
It does get confusing, which I think is down to shoddy directing, but it also does have a generally creepy atmosphere, it should have been better but it's still a solid 6/10