Meh. It's pretty cool. It's a beta so you can't really complain too much since the reason of Battlefield open betas are for stress tests, not for graphics, glitches, etc. They dim it down on purpose. But some things i noticed is that counter-knifing wasn't as great as i thought it was going to be. You can only counter-knife if you are getting attacked from the front and you'll pretty much always get the kill so it's pointless to even try and knife from the front with a 3 second option to counter.
i literally stood there and read what i needed to press in order to counter it. The controls for vehicles are different yet way more precise then bf3. Helicopter was a little difficult to fly for the first 5 minutes but you get used to it quick (I'm scared to see what they did to jets ._.). Aaaaand then there's the USAS brought back. Man, if people raged about it during bf3 they are going to HATE it now. Not only does it have frag rounds, but each clip holds 11 rounds and you can shoot it like a semi-auto pistol. It's explosions everywhere. it's so OP. I lol'd when i used it.