A bit late to the party ... I gave it a 4.
I really enjoyed it for the most part. A couple of things bothered me though. First was what I consider to be a whopping plot hole - the message being broadcast was from the Time Lords, presumably in Gallifreyan, yet neither the Doctor nor the TARDIS could decipher it?? At the beginning of "The Pandorica Opens" the Doctor said the TARDIS could translate anything. Did I miss something? I've watched it several times now.
The whole nudity bit with Clara's family I found to be quite cringe-worthy. 1000+ years of hanging out with humans and he doesn't realize what he's doing? Amusing, maybe, but it just makes him look like an idiot! (Shirtless Matt Smith though, yum!
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Another minor niggle - they said the planet was an Earth farming colony, yet they only got a few moments of daylight per day. Not to mention it was always snowing. I wonder how they managed to grow any crops under those conditions?
That regeneration scene - wow! As sad as I am to see Eleven go, I gotta admit, that was pretty spectacular!