Well that much is obvious, no need to be a wise ass about it
What I mean is that the character could have been anyone and it would still feel like you're playing as Harrison Fords character in the movie because of how well they matched the atmosphere, Ray remarks like Deckard throughout the game, dresses the part and tell me you didn't get a tingle administering those voight-kampff tests and feeling like Deckard making decisions on who is really real.
Don't get me wrong, I thought they did a great job expanding the Blade Runner universe and elements that played a smaller part in the film, amazing game really. It had a decent story line and the branching paths were not obvious rather very nuanced and well implemented.