To be fair, I don't think Grievous has been shown to be adept at strategy, well, ever. He should be, in my opinion, but writers seem to want to give him his position because he's scary. He sort of gets there in Stover's ROTS, but even in that most of his charisma comes from his ability to frighten his subordinates (or crush their faces with his fist). See, everyone says that, but I actually do not get an overwhelming "coward" impression in ROTS, and definitely not in the novel, which Lucas read and approved. Hell, Grievous has probably never been more described as a killing machine than in the ROTS novel. He ran from Obi-Wan and Anakin, true, but I see that less an act of cowardice and more an act of survival; he should know that he won't survive a fight with both of them together. He loses to Obi-Wan, but I prefer to see that as a triumph for Obi, rather than a failure for Grievous (which, again, was made much more obvious when taking the Tartakovski cartoon into account); a declaration that Obi-Wan is seriously good, fully deserving of Council status and the master of the chosen one on his own merit, rather than simply inheriting him from Qui-Gon. So I don't personally buy that the TCW portrayal is the more 'faithful' portrayal in regards to the films.