Pros:

-Really long campaign, up to more than an hour of calm gameplay.
-Very good Half Life 2 concept.
-Mixes very well with Left 4 Dead.

Cons:

-At the underground parking, there are too many infected that spawn at the panic event, thus making it very difficult for some players, not for me, but for some others.
-Too many Tanks spawn at the finale. One is enough.

Conclusion:

This is one of the best campaigns I have ever played. I love it and I'm sure everyone else does love it as well! If only there were a sequel.

Pros:

-Very high quality model.
-No flashlight on this gun, I honestly dislike flashlights on weapons.
-Very good textures, but maybe adding more scratches and signs of wear and tear would make this weapon perfect.

Cons:

-Reload speed is too quick
-No other cons on this mod.

Conclusion:

Overall, this is a perfect replacement for the original MAC-11, great work. I recommend this!

Pros:

-The common infected from Left 4 Dead are back
-Left 4 Dead infected look better than L4D2 in my opinion.

Cons:

- The animations do not work properly when they walk, they look like they are skating occasionally.
-Graphics and textures do not blend well with L4D2's graphics.

Conclusion:

Overall it is a good modification, but needs some improvements and tweaking.