Pros:

Fantastic recreation of City 17

The most unique Finale I have ever played

Loved the way that MOST of the campaign felt natural

Cons:

The random respawn "box-o-doom" on the Rooftops level, it totally made no sense.

The Finale could use some better audio ques to let you know that you're doing it right. I was stuck for like ten minutes waiting for the first gate to open outside of the radio room.

Although I understand the reason behind it, I personally didn't like having to download a special program just to play this campaign. ALMOST made me not download.

Conclusion:

If you are looking for a long, fun, and nostalgic (HL2 came out almost 6 years ago) campaign, LOOK NO FURTHER!!!!! There are only a few jarring notes in this pack, like the "BOX-O-DOOM" just outside the safe house in the Rooftops map, along with the elevator ride in the same map being cut. Now, I understand that a 1:1 recreation isn't possible, I just don't understand some of the decisions made in the remaking of this map. That being said, the adaptation is roughly 99% true to the original works, minus the lab area, but I wouldn't begin to tell you how to incorporate that into a L4D campaign and make it feel right.