Pros:

Good idea
Teleporter is awesome
Professionally done

Cons:

If you crouch inside the elevator while it's going up, and then press spacebar twice, you will glitch ontop of the elevator.
Too many tanks.

Conclusion:

Great campaign, but major glitches and an overwhelming amount of tanks prevent it from reaching it's full potential. 

Pros:

Great Bosses
Horde events are interesting
Originality left and right.
Custom enemies.
MY NAME IS IN THE CREDITS! (now if you would be so kind as to tell me how exactly i got in there i would be grateful because i don't exactly remember helping in any way)

Cons:

It tends to get very frustrating and hard sometimes, even on the easiest difficulty

Conclusion:

Overall, it's great and has a lot of things going for it. i'd advise playing it as soon as you can.

Pros:

Interesting and Well-scripted bosses
Bosses are challenging without getting too tough for just one Player and 3 bots

Cons:

Starts out Kinda Boring
Some of the Melee weapons are just a big "ERROR" sign
Shortest of all the Campaign Chapters
No Tanks or Witches

Conclusion:

this has to be one of the best scripted campaigns, with a bunch of fun scripted bosses and events.(i say that because all maps link to the previous one, but i feel this is the one i had the least fun, the start was kinda boring, but the boss really brought things up, then after escaping i was totally not expecting the final boss face fight in space, i don't know where the story can go from here, but you can do it! i'm sure of it!

Pros:

Interesting To have the L4D survivors in the L4D2 Campaigns

Cons:

there are 2 sets of L4D Survivors in the Passing Campaign.

Conclusion:

if your gonna swap the L4D2 survivors for the L4D Survivors ingame, switch the NPC Survivors from the Passing to the L4D2 survivors, which means you'll probably to pick one of the L4D2 survivors to die.

Pros:

Ammo Piles Strategically Placed
Wide Variety of Weapons
Interesting Cresendo Events
Finale is Challenging and Fun(during it all my teammates were dead or incapicpated)
"Secret" Rooms(yeah, you know what i'm talking about)
Space Shuttle: AWESOME!!!
Environments were beautiful looking and varied in size 

Cons:

Can't Really Think of any, i mean, i may have gotten lost in the maps a couple of times, but that was mostly my fault
When looking at the water from above in the 3rd map, there is a reflection of a big, pink texture.

Conclusion:

Overall, this is a really great campaign, and definitely one of my favorite community campaigns to date, second only to Suicide Blitz 2, after seeing the ending i think it would be awesome for you to create a Space Campaign and make it continue from this Campaign, it would be EPIC!!!

Pros:

Instructions are Very Clear
Challenging

Cons:

========== 1st Map ==========
Missing Skybox Texture and Missing Grass Texture Near Ending Saferoom( the default, pink texture replaces them, you know what i'm talking about
========== FINALE ==========
all four of the survivors were inside of the rescue chopper, yet the escape event was never triggered and the campaign never ended, 

Conclusion:

very fun and very interesting, but as i already said, the escape event never triggered, you might wanna fix that

Pros:

Very Close to the Original Game(i have all the puzzles in the Forest Temple Memorized)
Custom Scripts Work Well(The Common Infected Matching the Ghosts in the Forest Temples, the keys, etc)

Cons:

Finding the Keys is a big problem, i know where they are, yet i can't seem to find them after i do what is required to make them appear, you should really put glowing indicator lights(like how its displayed around first aid kits and stuff) around the keys so their easier to find, i had so much trouble finding the keys i had to noclip through all the locked doors.

Conclusion:

really great map but the impossibility of finding the keys is the only thing that really needs to be fixed, put a indicator light around them like first aids and pain pills have.

Pros:

Sonic
Sonic
More Sonic
how many times  do i have to say sonic?

Cons:

None

Conclusion:

Sonic is Awesome but not as awesome as Mario

Pros:

All Hail Shadow
Live and Learn
His World
Escape From the City

Cons:

Reach For The Stars

Conclusion:

Replace Reach For The Stars with a better song, thats it...

Pros:

Excellent Map
i've never seen a playable movie in a map before, i can imagine how hard it must have been to script
good variation and amount of weapons

Cons:

the sounds on the movie eventually desyncs
there's only one movie

Conclusion:

overall really good, just try adding more movies instead of just the family guy one, and try to fix sound desyncing.