After being revived from death and having to join Cerberus (a pro-human organisation) without a choice, Commander Shepard must assemble a team, battle a new threat and make tough choices in order to save the galaxy once more.
Mass Effect 2, in my opinion, is a marked improvement on the first game, and the main reason for that is because the entire premise is focused on character development. The goal is to put a team together, so as you get to know the companions joining you on your adventure, you're guaranteed to grow attached to at least some of them. That's how it was with me, anyway. :) Except for Jack, I liked every single member of my squad, new and familiar faces alike, so by the time it got to the climax, I legitimately didn't want any of them to die.
By this point, I'd developed Shepard into a fully-fledged hero who tried his utmost to preserve life and make alliances if at all possible.
Not to mention, this is where I had Shepard find love. Male Shepard and Tali will always be my OTP, because once their romance gets going, every single scene they share together is nothing short of adorable.
To sum it up, this game engaged my emotions in a way that very few other pieces of entertainment have. This is my personal favourite of the Mass Effect trilogy, and potentially one of my new favourite games of all time.
My rating: 90%