11GB for PC isn't unusual. I have a few PC games that are several years old and use that much space.
Man, I was considering purchasing BS2, but now that I've read the activation and Windows Live requirements, there is no way I am buying it. Authentication required just to save? That is friggin' ridiculous.
@Rab1d-BDGR:
Just because a game doesn't require activation or authentication doesn't mean it is free of SecuROM. Dragon Age and ME2 both use SecuROM for a disk check.