Even if our "choices matter," which they undoubtedly won't, it's really unrealistic to think it'll branch that much, especially with 8 variations of the same character being brought into the mix. It's just impossible, or more improbable, to expect that from any story in any game anywhere. Yeah, choice should matter, but they will never have the giant impact that will actually do them justice, and no the Witcher is not an example of how they do.