#2
Imo, farcry 4 was the pinnacle of the series, yes there were fetch quests etc, and I haven't tried the co opp, but it looks amazing. Gameplay was great, as were the graphics, it was well optimised and the campaign pretty good though I haven't finished if. Get it if you find it cheap.
5 looks good, much the same just different setting, going only from the launch videos though