Its does a pretty bad job at depicting addiction/alcoholism, knowing a thing or two about it myself. Like you just never drink the whole game and he never gets any withdrawal and just walks and talks normally with people? He wouldn't be even able to leave his hotel room because of the fear and doom. Depicting alcoholism realistically he'd probably just get a seizure and the if you didn't let him drink right at the start of the game. In the game he just has a little bit of a hangover.