I've seen worse acting, but not a whole lot worse. The plot lacks originality and, well, the murder "mystery" is only a mystery to the one who was there but *didn't* do it. The fight scenes are poor even for old B westerns. The sounds of two men struggling continue while the struggle is suspended during a rope climb, and then end in the middle of "round 2". Even the mandatory "good guy tackles bad guy from horseback" is missing: the bad guy's horse (his name must be SUV) does a rollover going around a sharp turn. One thing thankfully missing is the cliché rich guy running the rustling operation, but is doesn't matter--(nearly) everyone knows the head bad guy from the beginning.
Bottom line: one of the worst films I've ever seen, and probably the worst western.