the pandorica opens & the big bang

seems david tennant is too successful on being the doctor, matt smith still makes me feel the difference between two incarnations even he has more facial expressions.

karen gillan's amy pond is designed to prevent tenth doctor's problem happening again. the companion has a husband so there's no way to have another rose loving doctor so deep and making doctor regret for a period of time (even that's so tiny for his 903-year journey!).

but there are something not quite reasonable:

1. how can sonic screwdriver open deadlocked pandorica? and pandorica can be opened by little amelia so easily?
2. how can river song keeps enough memory to wake amy's mind on doctor?
3. will the crack appear again after doctor coming back? i.e. is problem really solved?