Time Out has a glowing review, opening by calling it "superb" and closing with this:
Magnificently directed and shot (by Arthur Miller), flawlessly acted by Peck and a superb cast, governed by an almost Langian sense of fate, it's a film that has the true dimensions of tragedy.The Examiner says, "Strong performances from the assembled cast and Oscar-nominated writing make “The Gunfighter” a must-see film for serious fans of the classic Western." EW recommends it, describing it as "a ruthlessly heartbreaking tale of a famous gunslinger ... grown weary of facing down an increasingly young bunch of challengers to his quick-draw supremacy." Images Journal has it on their list of 30 great Westerns. It gets a 100% rating from the critics at Rotten Tomatoes.