Pros:

- incredible  survival experience
-awesome level based in the movie!
-gameplay style building the barricades
- scavenge  furniture in order to hold and survive
- lots of detail and cool design, well placed items 
- l4d traditional campaigns never going to be the same after this one!! haha

Cons:

- cant wait for more

Conclusion:

challenging level design, awesome innovation, that single map for me  was like  a whole campaign, if thats the 60% of the  whole proyect its going to be epic when it comes out !!! BIG THANKS  to Lou Saffire for the great work

Pros:

awesome remake of Silent Hill 1
cool gameplay (puzzles)
atmosphere
diffculty makes an awesome survival experience
long campaign

Cons:

-some  issues downloading sound fix from the link...(my antivirus detected a troyan in the website where the file was uploaded ...THE FILE IS 100% CLEAN AND WORKING  is the website publicity the problem 

Conclusion:

gameplay is awesome!!!.. is not only about activate soemthing and survive a massive horde.. u got to solve and find things in big maps, the survival experience becomes better with well placed items, force u to ration ammo and think bfore start runnig and shooting.... the bots give u sort of backup but U R ALONE dont expect anything from them... 
-playing online with friends is the best way to go and survive this difficult, awesome and long campaign