The Bourne stuff wasn't a problem in terms of having grittier fight sequences. The problem was with the editing. The Bourne style is to stick you in the middle of an incomprehensible fight sequence. This makes choreographing it as well as filming it a lot easier, but it can also make the fight a LOT more chaotic due to the number of cuts. Casino Royale did fine with it, but Quantum of Solace was edited so poorly that I often couldn't tell which action related to what. And that as throughout the entire movie.
I thought Quantum had a kernel of a decent story but it was broken up by too many gibberish fight sequences. The seriousness of the character, his ruthlessness, etc. that stuff I liked. But that's not Bourne -- it's ORIGINAL Bond, as in, from the books. And yes, that stuff definitely needed to be in there. No more "quips," thanks.