OK, so the Doctor and co are stuck in a warehouse, with copies of people (The Gangers) trying to destroy their original human counterparts, even the Doctor exists in ganger form. Jennifer tricks Rory into activating the acid with the hope of blowing up the island. The Doctor must battle back to save them.
Matt Smith gives a good performance, I can't fault him a bit, he's really good.
Poor Amy could have sat in the TARDIS, they gave her literally nothing to do, until the very end, she has stood around looking awkward the entire episode, maybe the complexities of the story arc are very slowly beginning to make sense, eye patch lady talk about drawn out!!
The ending is at least rather shocking. Most disturbing moment must be the site of the discarded flesh, when Jennifer shows Rory the true cost of using the flesh.
When you break the story down it would have been more exciting had the Ganger Doctor been working against them. Were the gangers ever going to beat the Doctor, let alone two. Feels like the same situation they had in Kinda, too many companions, so what do they do? one is hidden and one is silent. It is very very padded out, an hour would have been good for this story, rather then two 45's it's too slow in parts. 4/10