I liked it a lot. It's not as good as any of the others on my list, but it's better than any of them that aren't.
My only problem with it was that it seemed to be trying for the "Jason Bourne" thing a little too hard, what with all the shaky-cam action going on. But I liked the movie itself quite a bit. It was refreshing to me to see a Bond villain plotting simply for personal gain as opposed to "OMG I want to take over/destroy the WORLD!" I also thought Bond's character arc throughout Casino and Quantum was very well done.
I honestly don't get the hate for Quantum.