Pros:

- Great concept
- Chance to get evrything that you want
- You need time. You have no it. You must build "exit". But before you must survive

Cons:

- That would be great like a survival map (maybe not instead this co-op)
- Playing with bots is chalenge. Hardcore. EXTREMLY HARD even on "easy" (they cant use tech tree/build barricades/use machinegun and you fighting almost alone)
- But playing with people is EASY. Well you can play on expert and probably it will be fun)

Conclusion:

If you play with bots you play almost only for building/unlocking/picking up. You must unlock new weapons. You must get weapon for yourself AND for your bots. You must get healpacks for you bots. You must barricade way alone with no support. And when you will get to the rocket you will must kill bots becase they will not go to the rocket.
If you play with frinds it will be easy to get weapon/barricade/way out. That man who will unlock weapons/building can feel safety. And not only YOU must do it.
Play with friends for fun time or play with bots for HARDCORE.

Pros:

- Very good maps (especialy good alternative textures)
- HARDCORE (realy need to safe ammo/healpacks/weapon)
- Quests are good (and the description to them in air are great)
- When you play this campaign you play not a "silent hill" yet. But it is not a "L4D2" anymore.
- A lot of nice time spending

Cons:

- Almost impossible to play with bots (They dont follow you, they dont pick up weapon (only if i dropped it by excchange for another one) they just stupid with bosses)
- Need a little bit more info about "what to do/ where to go at the moment"

Conclusion:

It is "must have" for "silent hill" or HARDCORE fans. If you play with people team map is almost perfect. But with bost it is very hard even on "normal". Also be carefull with "bot fix" because if you will die before your bots you will just stuck for long time. They will stay at some place and nothing do. And zombies with bosses will rare attack them. One of solutions for this problem: change difficulty on expert by voting and then wait. But it is anyway will be long. You can restart this chapter but only by getting out to menu. You will lost all weapons and healpacks that you will need.
So play co-op and map is perfect!