Yeah, I agree QoS was not as good as Casino Royale but it did grow on me.
I had heard so many bad things about Quantum of Solace that my expectations were very low. That actually aided in my enjoyment; it was not nearly as bad as I thought it would be, and was actually pretty good, although I could have done without the [OMG_it's_a_frickin_spoiler] parachuting [/OMG_it's_a_frickin_spoiler] scene.
This trailer looks alright. I'll see Skyfall in the cinema, I think.