Unfortunately most of the movies aren't very good. But this one is. Murphy plays a hired gunslinger whose method is simple. He goads his target into a gunfight, which he always wins. He's never convicted of a crime because the killing is plainly self-defense.
Murphy's really menacing in this role, and it's easy to see why all the townsfolk start wondering who his target is. In fact, they all have so many guilty secrets that each of them thinks s/he might be the one. Murphy lets them stew. Things start to simmer, and then they come to a boil.
If you think Murphy couldn't act, give this movie a try. And if you'd like to read an excellent bio of Murphy, there's one by my old friend Don Graham. The title? No Name on the Bullet.