This sort of view would be fine... if this were a traditional Bioware narrative. Hawke is certainly not a blank slate and she's certainly not simply an avatar of the player. The entire narrative revolves around Hawke's personal story; Her "rise to power" as the game's promotional materials so often advertise. The 3 acts (the deep roads expedition, the qunari crisis, and the start of the mage-templar war), the story of Hawke's family (which I would argue is the real main plot of DA2, and not the 3 acts), and even the companions are all framed in their relationship to her. Flaws in Hawke's character arc are flaws in DA2's narrative as a whole, because she is Dragon Age 2.
That Hawke's character simply does not work as a protagonist is a fatal flaw that cannot be ignored.