Actually CDPR never promised that your previous decisions would have a great impact on The Witcher 3. When this question was asked, they were always kind of reluctant and said that TW3 is more of a personal journey and that your older decisions would not have a great effect on it.
I don't really care what was promised, it's not like they kept their promises anyway. What I do care about is the fact our decisions were meaningless and characters simply disappeared from the world with no explanation or even mention of them, I don't like that. They didn't even give us our damn gear from the previous game.