Considering that unlike far too many of the show's episodes, the setting is something aside from modern day London, it's a shame not to see more alien characters in the mix. The little red chap looks okay, but aside from that (and the Hosts as they're being called) all I've seen is the fat bloke from Tracy Beaker and Debbie Chazen looking like a red pair of prats. I just hope, considering the line dancing-esque attire, we'll be subjected to some crappy southern states accents.
I know the budget always factors into things, and that this ep is pretty CGI heavy, but if wouldn't hurt to vary things visually a bit. It's a shame they waste so much money on countless Daleks or Cybermen, when they could be doing more weeping angels or even those scarecrows (both of which I imagine are vastly cheaper).