I accidentally deleted my save file. If you click new game and then left click anywhere, your save is gone. Not sure why they don't make you select a save slot or default to a new save slot. Lost 20hrs of progress with 2 accidental clicks. :/
Game is alright, decent action. The storm stuff is a bit of a gimmick. The tornado is the best. It's fun to watch and swing around it. Dust storm is annoying and crappy. Thunderstorm is okay--you get a sweet weapon from it. Story is mehtastic.
It streamlines a lot of things from JC3. No need to destroy everything in a base. You just destroy stuff at your own leisure, earn chaos, earn squads and then take over regions. Some repetitive aspects to taking over regions as you need to complete facility missions. Not many challenges to do outside speed stunts, bringing vehicles to a location, and wingsuit stunts. There are hidden tombs and statues to play around with, and some side missions.
Weapons are quite different. No hand-held bombs/c4 this time. No grenades. No pistols. Most weapons have alternative fire mode and many of them are explosive (e.g. noob tube for AR) so it feels adequate. I find myself swapping weapons a lot, unlike JC3.
Grapple has more options now, including air lifts and putting booster jets from range. So it can be more useful in combat. Most are not that practical for action.
Driving ground vehicles is pretty good, bikes are a bit weird. On PC the game is passable. Menu is pretty bad. Cut scenes look like garbage (videos). I like the different biomes and I think it mostly looks good. Not sure it looks better than JC3 though. Mouse speed is VERY slow by default. I have to double my normal mouse speed to get it to turn fast enough.
If you liked JC3 but thought it annoying to destroy everything in city areas, then this should be enjoyable (city areas are largely ignored). The jungle area is quite like JC2. Map is a bit sparse for me. Swooping with the wingsuit is still fun.