I see a lot of people on here expressing their dislike of the PC being predetermined as Married, Straight, and has Child. To this I say so what? From what we saw of the opening sequence there is actually very little explained about your character.
Who he/she is, where they come from, who they were, what they want to be, what they think of the world around them. None of these things are decided for you. You want your guy to be a "bad ass" who would shoot someone in the face? GO FOR IT! Why couldnt they have been that person before the events of the trailer? What if they tried to clean up and live a "normal" life? You want them to be gay? Maybe they are and it's a secret from the spouse (happens a lot in real life) or maybe they dont even realize it because they were raised in such a way to suppress it? Maybe they were a good person before the vault and then Cryo Freezing ( if that's the case) gives you psychosis or just the rough nature of the wasteland changes you into someone of that nature?
Yes, it is a pain that if you have a "extreme" backstory of your character you're going to have to work around/with this opening but it's not that bad or hard to do. You're limiting your imagination by thinking this "KILLS" your sense of Role Playing.
Think of an hourglass with the neck (middle where sand funnels through) is the opening of the game. What comes of your character before and after are completely in your control.