The beauty of Half-Life 1's plot was its simplicity throughout the entire game, until the very end in which you were bombarded with entirely new concepts. Half-Life 2 tried to build a complex plot but failed to follow through at the end. It's an excellent game, but it's missing something.
Wrong not28, the game is not missing something, the game is missing many things. It is obvious that the game is lacking, and to say that it falls short of greatness would be beating a dead horse.