Vengeance Valley has a classical western feel to it supplied by it's costume & setting, dramatic themes, stereotypical action and ideal acting.
It features a good performance from Burt Lancaster in his first western role, proving that he's a good actor for the genre. Vengeance Valley also had some good shootout sequences.
It also ended on a good dramatic note and had the ideal soundtrack to set the atmosphere.
However, it's nothing special to the genre.
It features a plotline thats too simple to even bother following and is paced incredibly slowly.
It doesen't feature much creativity and is rather simplistic, and the fight sequences feature qualities that may have been decent back in 1951, but are laughable by today's standards.
It also failed to supply a sufficient amount of continuous action scenes which are stereotypical in the genre and is fairly disapponting due to that. No doubt Vengeance Valley was low budget.
So in the end, Vengeance Valley presents nothing special to the western genre, but it gives a kickstart to Burt Lancaster who is clearly good for the role.