Very impressive game that will not disappoint you.
Thomas is a long range fighter, he is agile and can climb to high places using a rope. He can also use throwing knives to stealthy kill his enemies. A bow is also accessible only to Thomas.
Ray is slower, but stronger shooter and he likes close range fights more. Ray can wield two revolvers at the same time, use dynamite sticks and he can carry a gatling gun. Ray can also kick open locked doors.
Graphics are pretty nice and the environments are big: from western towns with bars and taverns to huge forests with rivers and Indian archers.The game for most part is linear, but in a few places you can move freely and ride a horse. In these parts you can visit shops to buy new guns and ammunition. You can also take side-quests here.
There is a concentration mode, when you slow down time to shoot all the visible targets. Each brother does this differently. But this skill has limited range. The cover system is very good too. There are many guns to choose from: revolvers, rifles, shotguns, bows, knives, canons, Gatling guns - everything you can find in the civil war time line. There are also showdowns in this game - duels between two cowboys.
So if you like western or just first person shooters, you will not be disappointed by this game.