I played the first game to completion but I never understand why people thought the main character was a good guy. Around the point you get to Mexico, there is a mission for the corrupt governor (I think), where you are tasked with burning down peoples homes. At that point, it's obvious that the governor won't even help you in your cause, but you do the mission anyway and he soon turns on you after you finish the task. At this point I fully understood that Marston doesn't care about anyone but himself and maybe his immediate family. He is just a selfish man whose past caught up with him and forced him to go do some task in the hopes of getting out of trouble. By the end when he is gunned down, I felt pretty indifferent about him and about the game in total. It did some neat stuff spawning radiant events while you traveled but other than that I didn't super enjoy any of it.
With that as my feelings on the first game, I really don't care about the new one.