I get the suspicion that those who dislike the third one just dislike or are bored by Westerns in general, probably because they haven't seen the Man With No Name films. I know I always felt it was the weakest of the three, until seeing those films changed my opinion on Westerns...and now I actually prefer the third to the second.
Love that idea of the brief moments with the sandbags appearing in the first one. And that "prank edit" is amusing too. ^_^