This game is fucking amazing. It's been a long time I don't get hooked to a game like this =)
This game only becomes truly epic when you play it alone at home imo. You will experience some unique little moments you will wanna tell your buddies about. Stuff like weather and random encounters can't really make the game feel unique. Hell I remember spending about 10 minutes standing still on my horse just looking at a storm approaching, the wind getting stronger, curtains dancing wildly, the earth getting soaked and stuff like that.
It's games like Red Dead that give me hope and strength to cope with the every day bullshit we all have to cope with. I hope I'm able to work on such a game one day!