Sasha was pretty scary at the start, but I found myself feeling sorry for her quite soon; the ending of her story was very moving. Those whole bits with Mitchell and Annie in the hospital were kind of like Resident Evil.
It was weird that they managed to make a lot of the stuff quite funny early on (particularly Sasha commenting: "I know, what's that smell?"), which is one of the great things about Being Human. It was good to see another Annie-centred episode too.
Meanwhile, the whole story with Mitchell and his "fangboy" was somewhat creepy (mostly the way Graham looked and dressed exactly like Mitchell). The arc with Nina being pregnant will be interesting too, though I got annoyed at her at the start (particularly when she chucked George out of the bedroom - I don't get why she had to do that, since I thought he made a good point. I'm wondering if the baby could end up being a wolf or something because they had sex while they were werewolves.