(Warning: some spoilers in second half. Read the first half for a quick look). I feel like this movie is very underrated. I read the many bad (and some good) reviews, became unsure, but gave this movie a shot and I do not regret my decision. You can't look at this movie realistically. I looked at this movie as a myth/urban legend put together as a film and ended up loving it. I will admit it got confusing at times and it had it's moments of "Why would you do that?" but if you pay attention everything makes sense. Truly. In short, this movie is about nightmares and what we do to keep them at bay. It takes a look at the consequences that happen to those who mess with nightmares. Look at the movie like that and you will enjoy it a lot more.
More in depth: Mr. Jones is just the nickname given to an unknown man who protects the real world from the dream world. He does so by using these scarecrows, something used often to scare away spirits. It has been used in many cultures throughout history. It's really not hard to understand that. You mess with these wards and you pay the price. That's exactly what happens to the protagonists Penny and Scott. It does get trippy and confusing a little past halfway through but the way I saw it is that as a result of their meddling both of them started to live in their own nightmare, being constantly deceived and tricked by these monsters. They don't know what's real and what's not. That's what a nightmare is like. That's what the two main characters fight through.
More in depth: Mr. Jones is just the nickname given to an unknown man who protects the real world from the dream world. He does so by using these scarecrows, something used often to scare away spirits. It has been used in many cultures throughout history. It's really not hard to understand that. You mess with these wards and you pay the price. That's exactly what happens to the protagonists Penny and Scott. It does get trippy and confusing a little past halfway through but the way I saw it is that as a result of their meddling both of them started to live in their own nightmare, being constantly deceived and tricked by these monsters. They don't know what's real and what's not. That's what a nightmare is like. That's what the two main characters fight through.