Some minor spoilers here -- you've been warned. 
I thought it was overall a good flick, but it didn't blow me away.  The initial action sequence was imo the best, after that they got a bit superfluous. (I didn't like the boat chase at all 

 )  Also, I don't think they pulled off the "Lets make this plot seem believable and a political statement."  Too many plots and side stories mixed in together in an incoherent manner, which came across as half-arsed and hurt other aspects of the movie. (IE character development...did anyone care at all what happened to anyone but M?)   
I guess I'm just squaring this one up against Casino Royale, which was in my mind phenomenal.  QoS did a good job of going back to bond roots -- action, girls, explosivo -- but lacked some of the quality of the last one.  
It's still worth checking out.
Note to self -- don't stay in explosive hotels.