Gun is offically the best western ever made, and it's tops for best 3rd person shooter of 2005.
The game's visuals are decent, the character models are pretty nice to look at, and some of the effects are good as well. The game is not perfect though, some frame rate problems bog down the gameplay from time to time, but very rarely. Some of the texturing can be muddy at distances and even close up. But because of the game's sheer size, we can forgive these problems, because they never detract from the experience. Some of the things worth mentioning would be the fact that the game can be extremely gory at times, you can blow the backs off of peoples head and also pop them like watermelons. So the game is definely not one for the kids.
The sound is also really amazing as the voice acting and script never feel fake and fit the game's atmosphere perfectly. I was personally a big fan of Thomas Jane in The Punisher and his voice fits this character perfectly. All the supporting actors feel real as well, thanks to high production values, something this game almost certianly had.
Overall your not going to find many games that are this much fun this year, the game works on all levels. From the horse riding to the running and gunning, if you are looking for a great shooter, pick this one up, you wont be dissapointed.