Taken from review:
The story campaign may be shorter than what people expected, but there are a lot of side quests to keep you busy if you opt to do them. The universe is well thought out and the dialogue is some of the best to ever grace a videogame. Characters tend to talk to one another and the universe seems alive. Learning about each character through engaging dialogue is a treat and everything that you do seems to have an impact on something, which you'll realize through the occasional news broadcasts on elevator rides. Being able to choose how you resolve situations and how you respond to dialogue is great. It falls short on some things but once you look past it you will get sucked into the story.