At least he stood up to the Doctor somewhat, but I agree that there didn't seem to be a lot of chemistry there. I think that's partly deliberate this time, though. Right from the start, Amy was hedging her bets about Rory, telling the Doctor he was her "kind-of boyfriend". When the Doctor didn't return, she settled for Rory, but I get the feeling she was never satisfied with the decision. Then he came back and swept her off into a world of aliens and danger and wonders, and she didn't know what she wanted anymore.

But it would have been nice if Rory had won her over more convincingly, instead of awkwardly making a fuss, being awkwardly jealous, and then awkwardly standing up to the fish vampire.

I'm curious what's up with the five-year gap advertised for the next episode. The Doctor takes them both home, leaves them, and skips ahead five years to see how they're doing? And Amy is pregnant. I want to know how that fits in with the rest of the season, and how her story works now that it's taking a sharp left turn from where it seemed to be going. The Doctor seems to be trying to "sort her out" by making her live a normal life, in some sort of hope that this will fix whatever it is about her that is connected to the cracks and the end of the universe.

But it doesn't seem that time travel and her adventures with the Doctor have anything to do with the cracks, because the first one appeared before she even met him. I think there's something purely to do with her that is either causing the cracks or attracting them.

As a side note, rewatching the first episode the other day, I noticed that after the Doctor left little Amy, the camera goes inside the dark house while she waits outside, and a humanoid figure passes in front of the camera and vanishes. At the time, I assumed of course that this was Prisoner Zero. But Prisoner Zero was not humanoid at that time. It was stated that it needed months to form enough of a bond with someone to take on a human form.

So what passed in front of the camera? Was it the future Doctor again, doing something to set things up properly? Did the future Doctor, perhaps, do something to the TARDIS to make it malfunction and bring the present Doctor back 12 years later instead of five minutes later like he planned? Did the future Doctor meddle in his own past, for some purpose? Perhaps originally the Doctor came back five minutes later like he planned and took little Amy for a spin around the universe and then he was never able to figure out in time that she was the key to the cracks. I dunno. Speculation!