From the review:
"Carrying on where you left off with your original Mass Effect character is a unique experience; possibly creating the one true sequel in gaming. Now I know this is a big claim, but it really is special. In most sequels you are continuing the story laid in place by the game designers, but now you are continuing your own story. Think about that. Every decision you made in the original game is carried across into this one, with even more big decisions awaiting you throughout."