The game has its flaws but it's still entertaining. It's definitely worth a try now that the price has dropped.
Most the reviews I've read complained about the Billy character and his levels. And to a certain extent I agree. Some of his levels can be boring, especially early on. I found myself trying to rush through his levels to get to Reverend Ray. But as the game, and story, progressed I think his missions became more entertaining. Early on you had to do a lot of sneaking and that wasn't fun at all, but later on Billy gets to see some action and that helps.
Which brings me to the best part of the game and that is Reverend Ray. He's a gunslinger turned preacher turned gunslinger. Let's just say he is one bad mofo. He has quick draw(AKA bullet time) with two guns at once which is a blast. He can also carry a rifle for ranged shooting and a shotgun for close quarters. The shotgun is kind of pointless because you can use your quick draw pretty much whenever you want. He also wears armor so he can take quite a beating. His character makes this game worth buying.
The graphics are good not great. The lighting is done well and so are the faces on most of the characters. The environments can be kind of bland at times. Voice acting is OK while Reverend Ray is by far the best of the bunch. He sounds like a man who means what he says.
Unfortunately the game is rather short. I probably beat it in 6-8 hours on medium difficulty. On the plus side the last few levels are very enjoyable and challenging. This may not be the awesome western you were waiting for but it is a fun game and not as bad as most reviews would claim. And it's only $20 now!!