Best part of Far Cry 3? Hunting animals. Or stealth killing entire outposts. Actually -- freeing a caged tiger in an outpost and picking off survivors from a distance. Yeah, that's my favorite.
From what we've seen of Far Cry 4, it will will deliver more of the good stuff. Here's a skit from Corridor Digital loosely based on the game. If the thought of animals floppily rolling down a mountainside makes you giggle, you'll want to watch it.