Mass Effect
This dialog sequence at SomethingAwful does a surprisingly good job of summing up both the positives and negatives of Bioware’s dialog innovation. Yahtzee, of course, does a good job of summing up all the negative aspects of Mass Effect.
Mass Effect does schizophrenically alternate between aimless wandering with lots of dialog, and long stretches of tense combat. It also saves its chewy goodness until you get all the way to the center of the tootsie pop, but it does finally deliver its epic tastiness. If your brain tends to snack on new RPG systems and content, that should be enough to pull you through to the finish.