As others here and elsewhere have noted, "The Revengers" is an obvious attempt to emulate "The Wild Bunch" and "The Dirty Dozen", from its casting William Holden and Ernest Borgnine, to the idea of hiring criminals to go on a dangerous mission. Though as derivative this movie is, it could all the same been a lot of fun in the right hands, but the movie ends up being kind of flat. One of the biggest problems with the movie is the direction by Daniel Mann. The movie is lacking grit and the necessary hard edge a revenge western really needs. Even the times when the bullets start to fly, the action mostly has a been there, done that feeling. (Though the climatic sequence does have some excitement.) But there are problems with the script as well. It doesn't script that many action moments, for one thing (it takes almost half the movie before the first true action scene comes.) The story also plods along with a lot of filler, such as the whole unnecessary sequence with Susan Hayward. While the movie never gets to the point of being boring, it is definitely lacking sufficient punch to entertain more than just die hard western fans. It's no surprise that it was a box office disappointment, though the then declining popularity of the western genre as a whole probably played a part as well.
Review of The Revengers
