Pros:

The creatures!
Minecraft!
The creatures are the best youtubers EVER
I cant be disappointed in this

Cons:

Nothing

Conclusion:

The best minecraft skins EVER

Pros:

This map is awesome!
Custom melee weapon
Custom tank skin
Awesome voice acting
This was just a really fun map that I have played a lot in 2012

Cons:

None

Conclusion:

The BEST map ever!

Pros:

Combines look awesome
Zoey has a blue visor
Awesome with alyx and gordon skins
Cool with unfolded stock SPAS
Goes really good with my Halo guns

Cons:

L4D1 Francis and Louis seem to be glitching (I dont know about bill yet) 
L4D2 Survivors necks are LONG

Conclusion:

The combines are cool and go GREAT with weapon skins and if you have downloaded the gordon and alyx mod before that it goes good. Both of the survivor groups have their cons, but overall, pretty cool... :D