The weapons feel good, the world is pretty, some of the waterfalls look pretty god damned awesome and its one of the few games I quite like the feel of swimming/going underwater, seeing the world above from under water.
Things that suck, you start the game with access to basically all weapons, you can afford any weapon you want instantly, it gives you more for free, there is so much money available the idea of getting free guns becomes worthless, and the idea of working towards better guns is non existant, these things are important in giving you a reason to explore and get better stuff.
Loot, ffs, the story is you were kidnapped, and now trying to save people, wtf do I want with money or "loot", its got loads of loot boxes, because other games like Borderlands are all about the loot, and game dev's think opening thousands of boxes is fun... its not, it might be if you got new/special weapons.... you don't.
THe game world is (afaik) completely open from the first minute, but it desparately needs some progression, working towards guns, and changing the enemies, having more dangerous enemies and different styles of area geared towards different weapons you need some level of staging.
Outposts that sit either end of a bridge, with some basically unpassably difficult till you get to a certain point in a game, so you get essentially area's you level up towards like most games, otherwise, its just daft.
Theres no, well, I feel as strong when I started the game as 5-10 hours later, the enemies haven't changed AT ALL, tactics, weapons, anything. They are easy to kill, never patrol in large groups and there doesn't seem to be more than 5 at the camps, making them pee easy to despatch.
I have mines and C4, and have not once felt the need to use them, ambush a patrol and its so hard and there is so many, the only way is to scout ahead, and booby trap the route... nothing yet, nothing close. There hasn't been a single complex attack.
Open world is fine, but without any feeling of progression or moving on, why am I doing half the stuff I'm doing? Its not particularly fun and there is zero reward? I can carry 10 more arrows? But I don't NEED 10 more arrows, so why do I care? Help man X out to get access to a new weapon/attachment/increased health potion. Sure, kill an animal so I can hold 10 more mines I never find any use for to start with because you let me buy a sniper rifle that makes the game painfully easy at the very start of the game.....
Far Cry 2 its feeling more and more like, fixed some things(making area's safe and without the travelling issues) but making it FAR too easy.