The first week (Nov. 27-Dec. 2) will be the quietest of the 3, but your weekend (Nov. 27-28) is Thanksgiving weekend and the parks will be EXTREMELY busy until Monday.
I've been over PW week for the past few years and it hasn't been too bad unless you're at a resort that is hosting them - then it can be crowded and loud.
Also the beginning of Dec. is a popular time for DVC - value rates and Christmas shows/decorations.