Originally Posted by
Solamon
That "douche" who directed the movie has been a fan of the game and the series since he was a child. The lore differences were done for simplicity's sake, and worked, in my opinion. They had a prequel novel released, written by Christie Golden, that set up the events that lead into the movie itself, and she also wrote the novelization for the movie. All of them work well together. They'd been up front for some time that the movie lore would be different from the lore we know, and I suppose you just missed out on that.
I would read the prequel novel, watch the movie again, and then read the novelization. It might change your opinion.