True enough. That seems to be an issue in all the action scenes (at the end of the car chase, when the car careens off the edge of the cliff and crashes, during the plane chase, when the jet veers off and crashes into a mountainside, etc.). It does seem that we don't get those really satisfying (odd choice of words, eh?) explosions to punctuate the scene and make us go, "Oooohhhhh!"I'm personally on the side that the boat chase isn't nearly as bad as some people make it out to be - it's a serviceable action sequence, its just too chaotic. It's symptomatic of the general editing problem Quantum suffers from. That payoff should be awesome, and prompt that long "ohhhhh" from the audience when it happens. I saw the film 4 times in theatres, with varying crowds, and it never did - mostly because people were whispering "how did he do that?"
Then again, I wonder if that was a stylistic choice. Most of the time, you really wouldn't get that big bang; as the "MythBusters" guys (and gal) tell us again and again, those explosions are just for show, Hollywood theatrics that wouldn't be the case in a real explosion. So maybe that's part of what we're talking about in terms of payoff. It's not only the pacing/editing of a scene, but also how the pyrotechnics are employed (or not).