Yis, the lag is bad. I'm playing on Xbox and its sometimes impossible. I'm used to playing on European servers but they must've changed the hit detection because it lags like crazy, and 1v1's I would've won on bf3 I lose on bf4. Its highly frustrating.
The guns to me feel like COD, with elements of BF3, but that could be the new mechanics I just need to adjust to.
The main issue I have are the controls, they've changed everything for console. And while you can switch back to 'veteran' controls, its not enough because the spot button is constant and that in itself throws you off. So I can barely drive a tank, I absolutely can't fly a chopper anymore, and haven't had a chance to try a jet.
The graphics are also pretty damn bad on console, damn.
Its just a bit disappointing as I think I expected too much from the beta. That being said, the bf3 beta was also terrible...so it might be a similar issue.