It is one of the greatest movies from a human condition philosophical standpoint. I watch it at least every couple of years and take away something new I have discovered about it each time. The movie is full of nuances and not every little thing is explained to you.
Because it is old, black and white, and impossible to watch in a distracted state I am sure this would not be many peoples cup of tea.
It is also fun to watch The Magnificent Seven after you watch Seven Samuri. Not as good, but a very entertaining take on the same story,