I agree with all the complaints, however I still had some fun. Some thoughts I had were (PS4 Pro):
Controls - Gunplay and character movement wasn't as tight as I had imagined it would be. There was a weird a acceleration or something to the aiming that made it feel off. However, I cranked up the sensitivity to 55 from default 30 and I think it helped a lot. After a little while I did seem to adjust to the aiming and foot controls enough so that they seemed fine.
However yeah, driving is kinda wonky but I guess serviceable. But flying is completely whack. I don't even know how they came up with the control scheme for the choppers. If you need to do anything other then go straight up and then fly in a line forget about it. Hilarious they put guns on some of them, they couldn't be more useless as its impossible to accurately point at anything.
AI - Weirdly inconsistent. Enemies would go from being oblivious that I was blowing the brains out of people around them... to hive mind swarm the second I was spotted. But then sometimes... it was completely fine and reacted in reasonable ways. Same for my teammates. Sometimes they would clear a village with ease, taking cover... leapfrogging each other, headshotting enemies to the point I wasn't even needed. Next engagement they would literally just stand around me in a semi circle and let a bad guy run right through them and shoot me in the back of the head. Then try to heal me while the baddie was still standing there shooting us point blank. Coop matchmaking though eliminates this.
The guns and customization were awesome though, I had a good time building my operator and the gunsmith workshop looks like its gonna be sweet.
I really enjoyed the scenery and atmosphere too, I thought the landscapes were gorgeous.
Overall though, theres still something inherently fun about a special forces open world romp and just going around wrecking havoc on the cartel. Theres not many other games like this that I can think of available right now. I joined a public game with 3 other randoms who were all very cool and we played the entire demo from start to finish, both regions, and it was freakin blast despite the shortcomings of some of the individual components. Rolling around in beat up trucks with gatling guns in the bed running convoys off the road etc was pretty awesome. Parachuting into bases and going stealth as long as we could and then busting out in big running gunfights was awesome. One thing I really liked was the lethality of both you and the enemy (played on 3rd difficulty. Above normal but not the hardest). No real bullet sponges. And the fact that you can get cut down pretty quick ups the ante on engagements a little. You gotta stay very aware.
I have a feeling this will be one of those games I get and really enjoy, despite acknowledgement of some jank that shouldn't be there.