The best thing you can do for yourself going into "Quantum," is to re-watch "Casino Royale." Preferably right before you head out for the theatre. That's what we did, and we were very glad for it. Because this movie picks up literally one hour after the last film ended, and there's no recap. You're thrust right smack into the middle of the action, going 100kph with lead flying, and you'd better be ready for it. 'Cause if you're not, you're gonna be left in the dust pretty quickly. Plus, if you'll recall, the complaint about "Casino" was that it was too long, so too long plus too short - when you watch 'em back to back - equals just right.
The simple fact is, "Quantum of Solace" isn't the NEXT James Bond film... it's the second half of the last one. "Casino" and "Quantum" together tell a complete, self-contained narrative - effectively the origin story of this new incarnation of 007 - and you really have to consider the two films as one. "Casino" had more humor, and more romance, because it had to. Because it needed to, in order for you to care about Bond and to understand the measure his pain. Conversely, "Quantum" is all about redemption, and discovering the bigger picture, and about Bond coming to terms with his guilt and his pain in the traditional way. You know... by kicking ass. Bond wants the bad guys and he definitely wants revenge for Vesper's death, but even more than that he needs to know that what he felt for her - that what she felt for HIM - was real. When he's done, a formidable enemy will have begun to take shape, and 007 will be the man he needs to be for this franchise to CONTINUE kicking ass.