Initial sales show Dragon Age 2 did worse then the original game for consoles (Couldn't find PC stats). Hopefully they'll learn from their mistakes.
First week sales of DA2 were better then Origins, but that could be marketing and all the Origins fans who pre-ordered...
Dragon Age Origins
XBOX 360
Week 1 - 335,941
Week 2 - 173,230
Week 3 - 96,340
PS3
Week 1 - 155,660
Week 2 - 72,304
Week 3 - 80,920
Dragon Age 2
XBOX 360
Week 1 - 392,508
Week 2 - 128,897
Week 3 - 61,735
PS3
Week 1 - 163,410
Week 2 - 61,210
Week 3 - 35,455