Preparing turkey gravy with drippings is the way to go, because the drippings are the where the real flavor is at. Using homemade turkey stock also makes a huge difference as it has more flavor, and it contains gelatin which give the gravy a nice silky mouthfeel. From there, use alcohol such as bourbon, sherry or white wine to deglaze the pan for a nice layer of flavor, or add chopped giblets or herbs.