So Multiplayer.
Mobile AA, what a joke that has became, guns that can now tear anything apart ( apart from people on the ground?!?!?), and Missle lock on and reload times at a STUPID pace, making anything that thought about flying once on many maps a waste of time, mostly the C-130, that is no made of paper and whose guns have extremely limited movement now.
FIM-19 I think for an over the shoulder weapon, it locks on FAR to fast, has a better range than any of the copters, and faster reloading time.
Why have all that tanks, copters, boats all been nerfed in the fact of this stupid notion that the bullets/ missiles suddenly take longer to reload or something, what utter stupidity.
NO counter measures work, they are all useless and don't get rid of any incoming attacks, especially on tanks where the smoke cloud is now good for about nothing, ECM Jammer cloud thingy might work, but then the missile might spin around in front of you for a moment then hit you anyways. Same for boats.
about 1/3 of the maps feel like they where just taked on, the railway one...what the hell is that?...about 10 buildings and the rest just a big open space!?...
Input lag...im having to hit reload maybe twice on a lot of occasions to reload.
Bullet lag...its not even lag, its inherently built in now, empty a clip into someone in front of you..nah..he has you pinned in two bullets from a tine PDW style weapon.
The entire Recon class is laughable now how much power each and every weapon has become, and the fact they can shoot faster than most handguns.
Scout, and Vipers etc, when did Attack Helis become so damn slow?...and weak, the missles arnt good for much, in the gunner position you are already nerfed with that stupid reload slow down, but also the normal cannon is just so damn weak now.
Scouts handle fine, but the mini guns blow nice little puffs of air from a hamster, good for nothing, esp against other Birds that if you had good enough skill you could take them out with those alone, now you can easily get tanlged going back and forth with each other, locking on..shooting, not actually making ANY lasting damage, you fly about...he heals himself pretty damn fast after that or suffer some bad random loss of control ( that usually results in you just being KIA and not from a actual weapon attack as you plummet to the ground) then go back and forth back and forth...assuming the AA that has to be on EVERY MAP hasn't got you already, not that you team can help as the AA can sit in the safety of its base and still be able to lock on to you!
Jets...bloody overpowered jets...don't seem to have suffered any of the reload slowing problem and can strife run on a paper C-130 in a single run and you are killed in it, total imbalance when pitted against that and Helis, you don't stand a chance.
Bloody noobs that can't shoot properly! 
