This episode feels like Moffat trying out whether The Doctor, Amy and Rory could happily work aboard the TARDIS as a trio, and it's a largely hit and miss affair.
The CGI in particular hasn't aged overly well in the last 12 years, though it still doesn't look great in modern episodes. That BBC budget only goes so far!
Helen McCrory (sadly no longer with us) is given a bit more to do than the average 'Who' villain, but this is, as I said, a largely hit and miss affair.
As with S5 in general actually.
The CGI in particular hasn't aged overly well in the last 12 years, though it still doesn't look great in modern episodes. That BBC budget only goes so far!
Helen McCrory (sadly no longer with us) is given a bit more to do than the average 'Who' villain, but this is, as I said, a largely hit and miss affair.
As with S5 in general actually.