I enjoyed it. It was fun (for a while) but it didn't make me want to continue playing it. I could put it down and go back in a week and I wouldn't be excited to get back into it again.
The storyline was, frankly, boring. I found myself skipping cutscenes because they just weren't that fun to sit through.
Secondly, I ended up going the same guy for most of the campaign (Thomas I believe, whichever one was the rifle/bow expert) for some supposedly more stealthy combat, which basically included 'silent' weapons like the knives and bow which just weren't silent since the game is all about scripted events. Fire an arrow into a guys head and he dies, sure, but the 5 enemies that spawned with him all know where you are regardless and they are still just as pissed off.
Another thing was how linear it was. I hate invisible walls, and this game has more than its fair share in various forms.
The games cover system made me want to hurt myself physically. It was pretty awful. Clearly this was taken from some Xbox or PS3 game and ported over to PC. Here's a hint for you dev's, IT DOESN'T WORK.
Even the big open areas where you had wanted poster missions to complete had the same things over and over, 'oh no, yet another person's wagon held up by 3 bandits hidden behind the same rocks as the last time I came across this exact same encounter'. Not that there's any benefit for you saving these guys, as all they do is say thank you. There's no Karma, nothing game changing.
With that said though, the graphics and setting were a nice refreshment. There is some beautiful scenery despite the boring gameplay. One bit in particular is where you blow up a dam and the water drains from a lake, which was fantastic.