It was terrible. Neither RTD nor Moffat have ever had any idea of the not very fine distinction between "impossible/implausible as far as we know but acceptable fantasy science" and "utterly nonsensical bilge." The old series crossed the line once or twice, but nuWho has never been back over it.
The bit at the end with Danny was a blatant attempt to rehash that bit at the seaside between Tennant's Doctor and Rose. As such it presumably wasn't supposed to make sense; just jerk a final tear. Cheap pathos, as you say.
On your point 6, I agree with you in principle. On the other hand, having presented us with an ostensible Santa, I would be inclined to demand that he honour that implied promise *and* make it believable and worthwhile. And when he fails in that, *then* overthrow him, with contumely.
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The bit at the end with Danny was a blatant attempt to rehash that bit at the seaside between Tennant's Doctor and Rose. As such it presumably wasn't supposed to make sense; just jerk a final tear. Cheap pathos, as you say.
On your point 6, I agree with you in principle. On the other hand, having presented us with an ostensible Santa, I would be inclined to demand that he honour that implied promise *and* make it believable and worthwhile. And when he fails in that, *then* overthrow him, with contumely.
But on the whole, well said!