"Doesn’t talk unless spoken to " is fine if you don’t want to talk about you private life but if it is work related you need to speak up when it’s necessary. Otherwise some co-workers start taking credit for shit you’ve done. Not to mention if you don’t build some rapport with co-workers good chance they don’t recommend you for a promotion or a raise or something even if you do your job well. Because you need to remind people of the work you’ve done and that only happens when you talk.

Also in large companies it’s good to be in the loop of what’s going on in the office, it’s how you can sniff out an opportunity for a raise or promotion or know when to leave before the ship sinks.