I know I'm not the only one who feels that way about it either, so this happens to be one of those times where I agree with the general consensus on a movie. You said you don't get why the movie gets so much flak, so I decided to explain my take on it. I didn't write this up as a gotcha or to tell you why you're wrong or anything like that.
I thought there were some great action sequences in the movie but they're buried behind a wall of atrocious editing which only ends up obscuring them. I thought the set up for the actual Quantum organization and the opera scene was really cool. Even Jeffery Wright's scene fell short for me whereas his scenes in Casino, which were short and minimal to the plot, managed to still be interesting. Greene's actor and Kurylenko don't really deliver anything particularly great. I think that's definitely due in part to the poor writing and realization of characters which there's a legitimate reason for, but also due to uncharismatic or subpar acting. I also feel that the dynamics between Bond and other characters in the film aren't very interesting. It doesn't have any hallmark sequences like its predecessor and sequel do aside from the finale at the hotel. A lot of the movie is very forgettable, I think. IMO the biggest issue is that the villain is very forgettable along with his master plan which never rang as 'sexy' as Casino or Skyfall.
