I wouldn’t enjoy a multiplayer beta anyway. I might be in the minority here, but I don’t even touch the multiplayer until I’ve finished the campaign.
And I wouldn’t enjoy a campaign beta either. It would drive me insane. Like getting to playtest Borderlands 2 the few times I’ve gotten to. The second I walk in, and I realize I’m playing a game I’m foaming at the mouth for, they basically have to shove me out the door at the end. And it’s all buggy and crap, too. Hahaha. :D