Played the Beta on the PS4 and if you play with friends the gameplay is excellent IMO.
Planning your mission, recon the objective ( drones are cool! ), decide where and who is going to approach...get compromised and watch it all go to #%&*$#. Great fun and can get rather tense when stealth.
A few things I think need improving. The driving and flying mechanics are terrible. The steering almost feels like it has a straight wheel mode and full lock mode. Hard to get a feel for the driving. Games like GTA V do the driving and flying far better IMO. The flying is confusing. It's like the collective and cyclic roles change mid flight...hard to explain. Just found it clumsy.
Overall the beta was very enjoyable. I think i'll grab this one. It was enjoyable and especially if you're intending on playing with a few mates. On your own....not sure. Friendly AI are not very I.