I never bought into the "vulnerability" aspect people like to bring up when it comes to the bridge's location. The shields and such make it just as protected as any other spot on the ship and why would an attacker take out the bridge? Sure you'll probably kill the command crew but then there's still 100s of other people on the ship who can take over. It'd be better to take out the engines, the weapons systems or the deflector which can in of itself destroy the ship. And those are all bigger, easier, targets.