"A Fistful of Dollars" is probably Eastwood at his best. "Unforgiven" is a better movie, but you have to consider the budged of "A Fistful of Dollars" and the time it was made, this was the movie that launched the Eastwood western franchise, his whole movie persona, even Dirty Harry, is based on 'The Stranger' from his work with Sergio Leone.
If you've never watched any old Eastwood westerns, the three you have to see are this one, "A Few Dollars More" and "The Good, the Bad and the Ugly". Gian Maria Volonté is brilliant as well as the villain Ramon Rojo.
9/10