I think that David R. George's strength really lies in his deep exploration of character. I don't want to necessarily box various authors into their own "niches," but if Christopher is great with the science stuff and David Mack is great with the galaxy-changing "epic" stuff, then DRG is definitely good at taking the characters to places they wouldn't normally go, basically putting them through hell and seeing how they respond. Sisko in his Typhon Pact
novels, the "big three" in the Crucible
trilogy, and now Sulu (and to an extent, Kirk) in Allegiance
. I love his treatment of the characters. We get some great examples of true drama! Love it.