Pros:

EPIC
Very cool ideas
Long enough
Big challenge
Tanks are never enoug
Made me scream a lot

Cons:

Playing on hardcore is impossible, really
I had nightmares

Conclusion:

This campaign is a MUST: if you haven't played it yet, what are you waiting for?!!?!?

Pros:

Silent Hill
Good immersion
A good challenge
Not the same mainstream campaign

Cons:

Some bugs (in puzzles)
Pain in the *** with bots
A bit long

Conclusion:

Playing this campaign with bots it's crazy, they don't know what to do the most of the times!
I suggest:
- take the day off
- call 3 friends (don't tell them that it's a 7 map campaign :P)
- download this campaign
- ???
- profit (if you don't lose your mind)

One of my favourite campaign of all time.