Pros:

Amazing campaign, very well made. It felt and played just like an official campaign made by valve. Lengthy and immersive, my friends and I thoroughly enjoyed it.

Cons:

The football field ending on "normal" can be a little rough. This is coming from an advanced player, sometimes your whole team can get stuck behind the tank while running for the helicopter. Other than that, no cons!

Conclusion:

Download this campaign if you want a nice long one to play with your friends. It's quite difficult at some parts, and feels good to complete.