If you're paying attention to what Bond's doing throughout the film surely you will understand why he is motivated to do those things. The criticisms against the movie for lacking in character development are downright absurd- it's all there, the movie just doesn't stop and explicitly tell you what it's doing. What 'Quantum of Solace' does is weave the characterization into the plot and action to the point where we don't have room to breathe. If you were expecting a lengthy, down-to-earth, 'realistic' ('plausible' is probably a better description for 'Casino Royale') character-based revenge flick, 'Quantum of Solace' is not it. Does 'Quantum of Solace' deliver? Well, honestly, the answer to that depends almost entirely on what you were expecting. After the emotionally charged story, and particularly the climax, of 'Casino Royale', the bar was set very high for the follow-up. Whether or not you liked 'Casino Royale', and most people certainly did, Roger Moore fanatics probably excluded (hey, I respect their opinion), it was something Bond had never been before, and it surprised a lot of people and reinvigorated genuine interest in Bond after 'Die Another Day' by which point it was frankly becoming an obligation to attend the new Bond film rather than a pleasure.
