Worst time travel movie ever. So many plot holes. Action sequences are ridiculous with cars driving 100mph in reverse for no good reason. Then same rules don't apply later in the movie.
If I wanted to be confused and bored for 2.5 hours I would watch a foreign film without subtitles. Would probably feel better than I do now after Christopher Nolan just took a huge dump in my eyes, ears and brain. Save your money and watch back to the future.