I've only had a chance to play for a couple of hours, so really didn't accomplish much in the game. Played about an hour last night when I got it and then another hour this morning.
I only have one of minor gripe about it right now.
It feels too GTAish. I wish they would have revamped the engine a little more to distinguish the feel of the game from GTA. I think Rockstar just needs to make a whole new game engine because I think this one is starting to seem a little dated.
It's kinda cool how this world sucks you in though. I kept telling myself stick to the missions because I wanted to get through some of the story, but I would always end up roaming the countryside, hunting, and skinning things. Just riding around and exploring on your horse is pretty fun. This world is going to be a total time suck. I am going to get no work accomplished for the next few weeks.