Have not had to many problems with it.Online can be a pain sometimes but not very often and there are a few graphical errors here and there but nothing game breaking.
Hmm, maybe it's just me then:
-Every time I finish shooting while using cover, Marston doesn't drop back behind cover. So I'm just standing there taking shots to the head until I disengage from cover and then go back in.
-I once walked into the Mexican capital's fortress thing, and every guard in the near vicinity began shooting at me for no reason.
-I've only been able to succesfully surrender to the police twice. Other times, I'll stand there with my gun put away and they'll continue to shoot at me.
-Cutscenes routinely play with only audio.
-After I finish missions, the game will freeze sometimes.
-Autosave doesn't actually save anything sometimes, so when the game freezes after missions, I have to go back to my last manual save.
And the final thing that pissed me off was when I whistled for my $750 horse and a stupid brown horse that I've never seen before showed up.