I must admit, I wasn't expecting much of this episode. But I was pleasantly surprised. They handled the setting well, and as always, very imaginative. The thing I had a problem with is the Martha/Doctor dynamic which, to me, still seems very forced. Of course, I think the Doctor and Rose were amazing together, so I'm biased. But something about it didn't sit well with me.
Still, classic one liners and the Doctor was on top form, with amazing characterisation as always. I think that once the dynamic between the two main characters has settled in. we're going to have a good series.