Pros:

CRITACOLA?
Team-Fortress 2 reference...obviously.

Cons:

Sadly,I have quit playing L4D2 because of the connection issues (no points taken)

Conclusion:

A must download for all TF2 players.

Pros:

I'm not a fan of RE but yeah,I found it a bit nice.
For fans of RE

Cons:

Made me shit bricks.

Conclusion:

If you want this skin,I won't judge you but the deranged model is too creepy.

Pros:

Portal 2 easter egg (plus G-Man in one of the tests)

Day and night suits the whole campaign.

A better finale (rather than the first one's) 

Custom melee weapon

Cons:

It's too well detailed...wait,isn't that a pro?

Conclusion:

A must download.

Pros:

Portal 2,amazing!

Suits the witch.

Cons:

Portal ones wouda be better (not taking any points,only an opinion)

The first menu theme would be better too.

Conclusion:

Deserves a download from all Portal fans.
Waiting for moar portal stuff...