It was a bit dodgy on launch and until early this week but now the lag is gone along with some other issues. Still some problems though, crashes & graphical.
On air vehicles: if a good pilot gets behind you with the main cannon you've got one hell of a job trying to lose him, that's when you hope you've got some good anti air to lead them into or a friendly jet to come up behind him. All in all I think they've balanced out now that the unlocks are there.
I do wish they'd add more transport vehicles though. About 5 - 6 people get left to run on a 64 man server. The ability to create fresh squads would be nice too, so that you can choose who you're going with.