Been playing it for most of the day and it is pretty good, nothing ground breaking compared to any of the other open world games etc.
It has sort of combined everything of the first 2 games.
Game runs really well on my i5 750 (stock), 8GB RAM and 4850 512MB turbo ice q4 at 1080P (some stuff on medium and a few things on high with a couple of things set to low, I could probably turn a couple more things up, still experimenting) and it looks pretty. It is a wee bit choppy in the videos though, but not bad enough to ruin the experience.
Haven't done much "proper" gameplay yet, just gathering as much as I can first and crafting things.
Has plenty of options in the settings to choose from.
Got to say I feel like Rambo using the bow in the jungle against bad guys
Although they still haven't really learned from far cry 2 about the constant run in with bad guys, can't go anywhere on the main roads for more than 3 or so minutes before you run into people......