Enjoying it so far after the usual teething problems adjusting to a new BF. Might just be the novelty of new maps, modes and weapons, so it remains to be seen how much longevity it has.
The UI feels a lot clunkier though. Unless I'm missing something, there's no way to buy stuff during round changes, so you have to wait until game time to do it. Not to bad at the start of a round during the count down, but shitty if you're giving up actual play time to do it, leaving your side a man down.
Changing squads seems similar, in that you can't do it even while dead, the icon is locked out, and have to wait until you respawn to do it.
Those are minor annoyances though, and if the gameplay is still fun then it won't matter. weapon / class / side balance probably isn't even worth worrying about since it's never right and will just end up being a merry go round of rebalancing like most of the BF games go through.
Still, it might be the first BF game, baring a couple of the side ones, that I don't buy on release and instead wait for a good sale or something. That has more to do with not really having spare time or money for it, but does indicate it's not as riveting as the others have been for me. We'll see how hooked I get during the beta though...