Had a quick go at the xbox version last night. I was a little sauced and had the volume very low because it was the middle of the night and didn't want to wake the wife up, so I'll have to give it another go before I can have a proper opinion on it, but here's my thoughts so far.
It's a little glitchy, and it looks like the textures have been scaled down, probably to keep the download size small, but that's to be expected in a beta release. I think if they iron out the little issues, it's going to be an awesome game. It's definitely a different feel to rush in BC2, and nice to have some indoor action. I would have liked to see some conquest on the big maps, and some vehicles as well though.
They've made some nice new features, like prone, suppression, choosing if you want to be revived or respawn, etc, and the character movement and hit detection are much better. I must say, it's way easier to kill people than in bc2, but also easier to die.
All in all, I think that it'll take some adjustment from bc2, but it's going to be an awesome game.
I think the thing to bear in mind is that the purpose of a beta is so that they can have a dry run and find and kill any issues, and see how the servers handle actual people playing in a live environment, it's not really to let us try the game out. Considering the closed beta is only 48 hours before the open beta, that's not so much of a reward, but I think it's rather a way to start the beta testing with a smaller load, so they can fix problems before everyone else gets on, then when the open beta starts, they get to test with a heavy load.