I suppose it's best if I start with what's best about this song. It captures the majesty that I want in a bond theme. It feels mixed well. Adele performed beautifully on it. It's everything you could want in a Bond theme. Thing is Amy would have given you more. It's hard to say if someone was holding Adele back of if she just couldn't take it that far but Amy would have came harder just a bit on this. On the chorus in particular it feels like she was holding back at best. Don't get me wrong. Adele would get it in a heartbeat but Amy would have been just a touch sexier in a bond song just had a little more sass that I think compliments the character of Bond well.
See also: Possibly the greatest Bond theme Goldfinger by Shirley Bassey if I recall correctly
Man what I wouldn't give to have had Amy cleaned up just long enough to give me a Bond theme and maybe 2 more albums just 2 more albums.