A Film For Grown-ups
It seems to me that most of the people who are upset by this film are those still unwilling to see beyond the thrilling archetypes of heroism and adventure they first discovered and fell in love with in their childhood. At a certain age I too might have refused to relinquish cherished notions of the immortal nature of legends and legendary tales. My heroes can grow old and foolish? Never!
But sooner or later everyone has to discover that all legends have an ending. Certainly this film has a certain jaundiced and satirical take on the nature of heroism and legends, born of a time when people questioned the traditional view of things to a degree never seen before (or, apparently, since). Yet all the characters and circumstances of adventure are approached with such an affectionate eye by the director, writer, and actors that somehow this film brings the curtain down on the Robin Hood legend in a particularly loving way that brought tears to my eyes when I first saw it (and still does).
So all I can say is, you have to grow up (figuratively or literally) before you can fully appreciate this magnificent film.