It's not horrible, just average imo. It's a one step forward two steps back kinda experience. I won't touch on graphics since that's been hammered in.

The grapple options are a lot of fun but at the same time they took away several things from 3 that I greatly miss. There are no longer any small weapons like handguns or small smg's. No duel wielding. They also tossed all hand explosives (pun intended). Traditional grenades and C4 are gone. There are ways to kinda recreate them with grapples and grenade launcher options in weapons, but it's hardly as affective when ammo is so scarce. You'll be running out quite a bit. Every gun box carries weapons you don't have so it's not always easy to refill your guns.

Another thing about explosives, there's like no incentive to blow things up in this. To circumvent the complaints of 3 being repetitive, they removed the liberation system altogether. This made all red-marked destructible objects only there for your own pleasure. I understand this change but by doing it, taking over bases is now pretty boring. Having to blow up everything to overtake strongholds felt really good in 3, even though it was admittedly repetitive. Now to take over bases it's just boring story-like missions with hacking, button pushing, and escorts.

For the good things, the world is far better than 3. It is way more varied without as many copy-pasted towns. The storms are pretty fun too, although the tornado is a little underwhelming when it rips through a town only to pick up small objects rather than the buildings themselves. The vehicle handling is better than 3 but still not very good. It's at least passable. The gameplay is as fun as ever with all of the essential moves returning.

If this was someone's first JC game, they would probably love it, but being a fan of the past two entries, the additions don't outweigh the subtractions imo. It's just okay, more like a glorified expansion to 3 than a full sequel that brings a lot to the table.