Pros:

Visually looks absolutely stellar. A massive amount of skill and effort has clearly gone into crafting the levels.

Lots of variety in environments and level layouts. There is something new to see around every corner.

Not just a quick port from the L4D1 version, pretty much everything has been improved and in many cases completely revamped for the better.

The custom tanks in the finale are an example of the amount of thought and dedication put into every aspect of the campaign.

Plenty of epic moments and some creative crescendo events.

Foam finger melee weapons! It's hilarious fending off NFL tanks when everyone has foam fingers. :)

Easter egg! ;)

Cons:

Some levels are possibly a bit too long, but this really is nit picking.

Conclusion:

One of THE great L4D2 campaigns. It has been a privilege seeing this develop over the last year or more. I know how much time the author has put into this, and it's great to see the fantastic reception it has been receiving.

Lastly, congratulations on being featured by Valve on l4d.com. Thoroughly deserved!