It made me feel like I’m living in a real western movie, a experience that transported me to a different time and place, where I could live the life of an outlaw and it's so fun and immersive that I can literally spend hours without doing any mission at all - just hunting, fishing, encounter strangers or just discovering brilliant points of interest (like the Meteorite and Meteor House), activities or hidden secrets.
Sometimes, I just like to observe what the NPC's are doing in their daily life, working in different locations like Appleseed Timber Company, Annesburg Mines or Central Union Railroad Camp or the conversations they have.
The story is amazing, the characters are believable and memorable, though some of them are not so likable, and the world is huge, beautiful and filled with tiny details.
Rockstar masterfully managed to make me constantly have the feeling that the worlds reacts to my actions, and this elevates it to a real masterpiece.