I think Skyfall is without a doubt one of my favorite bond films. It incorporated so many designs, references, and that bond "feel" that paid homage to the original Connery films. Spectre however was a step backwards... Sam Mendes is a great director, and with him at the helm of this movie gave me hopes that this would rank up near Skyfall. I feel as if the movie had potential but needed some more rewrites on the script than of the story itself.
I agree with you that this movie deserved a 7.5/10 rating.
This is just my opinion.