It's longer and has more depth then the first game. I have the strategy guide and from the amount of exploring and side quests, I feel with my time invested I only covered about 60% of the game. When you reach the end of the game you are given the choice to continue working on research and side missions with your current level, or you can also import your character back into the beginning of the game and play through again. With the amount of dialog choices and different paths the game can go into, honestly you can play through at least three times to truly experience the entire game. It is that good of a game, and it is that well written.