So all in all I loved the last episode of Dr. Who. Amy in a pirate costume, Rory liking Amy in a pirate costume (has someone written that yet?), the cliched kid-has-a-misleading-view-of-his-dad, the Siren as a doctor, the interpretation of the black spot, Captain Avery's trying to figure out the TARDIS, Eleven being Eleven...
But. BUT. During the last ten minutes or so I found my suspension of disbelief being stretched. I was able to accept the Siren knowing the significance of a wedding ring (an alien culture would have different mating/commitment rituals) but the 17th century pirates being able to fly the ship was ridiculous. Whatever, feel-good ending.
The thing I had a real problem with was Rory, for several reasons:
1.) Does the TARDIS really not have facilities to help him? Even if the Doctor didn't want to cure Toby's fever because it was an anachronism or whatever, he should be able to help Rory. And he doesn't help with the CPR, which, OK, he might not know how to do it on a human, but he just stands there after helping carry Rory to the TARDIS
2.) OK, they want to do the Rory/Amy thing, I can deal with that. "I'm a nurse. I can teach you how to save me," Followed by, "Do CPR, you've seen it in the films." Not number/depth of compressions, not number of breaths per second... How is that "teaching?"
3.) "What if you don't come back to life?" A valid question. I've taken CPR classes, and despite the movies, it seldom resuscitates people. It's a stopgap measure to keep some (some) oxygen flowing to the brain until the EMTs can get there with a defibrillator (see my earlier point re: the Doctor). As a nurse, Rory should know that.
So the whole "I trust you" thing was kind of lost on me. I did worry for a moment that Rory might die, and remember thinking "If he dies from drowning after being brought back from death and nonexistence I'm gonna be pissed." But no, standard movie ending, the CPR works.