It’s been a long time. How have you been? I’ve been really busy being dead. You know... after you murdered me?
Since first part this game made giant progress in story, gameplay, amount of characters, cutscenes...
Portal 1 simply can't be compared to Portal 2 - the games with different world. Portal 1 shows 10% of world of Portal 2 :)
And Portal 2 is something that can make players forget about Half-Life 3 for a long time - really nice game, growing up on people's eyes.