Chardonnay is the dominant grape of Burgundy, consisting of over 61% of plantings. Now keep in mind this includes Chablis, which is by law 100% Chardonnay.
What makes for a great Chardonnay? That is the core question.
Links to address this question
Qualities of the best Chardonnays in the world
How does oak aging impact Chardonnay?
What makes a Burgundy totally different from a California Chardonnay?
One of my favorite articles of all time at Wine Spectator, from 1997: The Chardonnay Challenge