For A Few Dollars More is so-so (but I’d still watch it again), but The Good, The Bad, And The Ugly is epic.
And if you enjoy them, then take a crack at High Plains Drifter or Pale Rider which are both excellent though share an underlying theme. The Outlaw Josey Wales is also well worth a watch, as is the magnificent (and best picture Oscar winner) Unforgiven starring and directed by an older, wiser, and grittier Clint Eastwood.