Summary: I absolutely loved the passing. It's th first time that there are more survivors alive than just your group. I loved the witty references adn the m60 is my new favourite gun. The golf club is a valuable addition to the vast group of melee weapons.
Summary: It should of just been DLC. Nothing's changed, theres some new mechanic's but other than that, it's basically the same, artsy Co-op FPS. The reason why L4D is good is because it's one of the few games where the Co-op is "Good".
Summary: What you get is a campaign that just seems like a more polished version of a custom addon campaign. It has its fair share of technical problems, and its far, far too easy, except for the sudden, but satisfying difficulty curve at the end of the campaign.
Summary: The Passing includes a new 3 map campaign with the l4d1 survivors as npcs, a golf club, a m60, a new uncommon infected, and a new weekly mutation mode. The map is pretty well designed and fun, and the conversations with the original survivors are usually funny although limited and brief.
Summary: Kind of a "meh" experience. It was fun to see the new survivors, and the witch in a dress.. But there was nothing much else that stood out. The L4D1 survivors say nothing about Bill's death, they seem rather happy too. It's strange.