The Beta is embarassing.

Shitty graphics and still lags? COME ON, EA! You can do better! -.-
But the rest is OK, I think. Physics are funny and the gameplay is (if you dont have lags) actually OK.
But the grpahics issue influences my opinion about this game too much.
Try to run the updater ( in the BFBC2-File) as admin, they made some patches which cause some better performances. Also an update of your graphics card driver could be helpful!
I,with mine ati 4850, can play it very lag-less since i have updated my driver and the game. I hope you can enjoy it as much as i do!
I would say that the full version of bad comany 2 is gonna rock much more than the beta because of the different maps and the CONQUEST (yah baby!) mode. So be patient, its just a BETA!
I hope were gonna see us in the battlefield!
Ado