I started playing this game recently and it's incredibly fun. I know a lot of games tout the whole "combat puzzle" thing, and how you can find a number of solutions to any situation, but Far Cry 3 totally nails that feeling.
I feel like a total badass when I swoop down to a hill on a glider, scout out the enemies, snipe a few guys, set a tiger loose, start some fires, and finish with a takedown or two. Very empowering. I don't even care about the story missions. I'd be happy with a whole game of taking down outposts, climbing towers, and finding collectibles, which is basically all I've done anyway.