This episode has some decent bits but is disappointing for me overall. Writer Toby Whithouse has talent and wrote School Reunion which is a real favourite of mine. Sadly this story is rather lacking in bite (pun intended). I think it is a bit flat, muddled and a bit silly in places. I find some bits too daft for my taste.
I do not like the scene at the end of the previous episode where Amy tries to seduce the Doctor the night before her wedding. In this episode there are references to that and the fallout for poor Rory. It makes fun of her attempted infidelity and of Rory which I find unfunny and unpleasant. It makes me uncomfortable and detracts from my enjoyment of the episode.
The story is rather too derivative, not just from vampire stories which one would expect, but also from other Doctor Who stories. It has similarities to Whithouse's earlier, far better story School Reunion in some of the content. The 8th Doctor Audio Adventure 'The Stones of Venice' from the Monthly Big Finish Series (which isn't a favourite of mine) has a lot of its ideas lifted for this too. In addition there is a scene where the Doctor climbs a tower in a storm which seems rather copied from the 10th Doctor story Evolution of the Daleks.
Doctor Who often repeats ideas but the problem is that this one doesn't give those ideas a fresh quality or oomph. It feels a bit lazy. It could have had nice acknowledged references to The Stones of Venice or used ideas more interestingly but it just seems a bit of a throwaway filler.
The story also has a couple of dodgy effects and an unimpressive climax in my opinion. I think it needed more effort.
This is not awful and has a few nice bits of dialogue and performances but for a Doctor Who episode I find it disappointing sorry.
My Rating: 5.5/10.