Summary: First off this a puzzle game, not a shooter. GameStop, Why are you calling this a shooter? Smart people, please don't get this. The whole game will only take you 2-4 days or 10 hours (MY GUESS NOT ACCURATE), VERY short. Even though GLaDOS is funny and the puzzles are great and the story is 100% awesome, this game has absolutely NO replay value. Why? Because you already solved the puzzle and you cant make new ones. The characters have a lot of.. well, character.
Summary: I played and really enjoyed the original and was really looking forward to playing this. I progressed I think more than half way through and got bored with it so I left it unfinished. I know this is contrary to the other reviews here but for me it failed in a number of ways. Portal 1 was fresh and original and encouraged you to think out the box which for me was its appeal.