Pros:

Looks nice.
Pretty long.
New ideas and events.
Run and gun finale.
The firepit was great fun!

Cons:

Crashes due to virtual memory in map 3 [I have an SSD so don't use a page file].
Visual basic crash after the finale.
The survivors do not shoot or get attacked, they are just ornamental which is a pain as you are relying on them instinctively.
Need more melees if you are going to be forced through unending panics.
The arrows need to be a little clearer on the first map, we went in a loop twice around the house!
Not enough respawn rooms really.
Firepit timer not tight enough, ran it easily with a needle.
First map could really do with a split after the house [force through the train and make it a safe room?] cause it was pretty long for a first map. No chance to really warm up.

Conclusion:

Had a lot of fun exploring the campaign, felt like new places, especially the farmlands which seemed better done than Blood Harvest. The crashes I was having were shared by one other person so it was not unique to me I guess. I'm going to reinstall on a regular drive and have another go tho, cause it was good fun.

Pros:

Feels like a proper L4D campaign.
Good challenges but not unbeatable.
Loads of walls falling down and surprising us.

Cons:

Could have had a fifth map.

Conclusion:

As to my con, I feel the transition from countryside to prison was a bit brief, not enough security. I would have liked the concept of breaking Into a prison for an additional map. The idea that you would take sanctuary inside a prison is nice one, after all then yo become a prisoner to the infected. Plus the idea of escape to safety within the prison only to find the inmates ready to eat you alive is a good one. However as is, it's not over thought, a jolly little 4 map rush and we all had a great time playing it. Thanks Saleck!

Pros:

Looks amazing.
So much new stuff and all of it top quality.
Really well paced with everything in the right places and events well spaced.
It's just plain superb.

Cons:

None.

Conclusion:

Play it, play it, play it! Really! Just go and play it!!

Pros:

Well paced.
Looks good.
Original finale.
All works without flaws.
A real challenge.

Cons:

Disco colours on map four, which is a shame as it's my all time favorite map :(

Conclusion:

For L4D1 still my favorite, although Detour Ahead is pretty close. However the graphical problems on the 4th map hamper this one. Don't get me wrong it still all works and it's all great but get to map four and it's disco fever! Certainly 100% but only when Diputs figures out what went wrong. Please!

Pros:

Very challenging on expert
Multiple routes on map 3
Pretty
Good flow and items and pickups well placed

Cons:

Bots love to drown on map 2
Bots get stuck by the scissor lift on map 3
Hell of a lot of zombies living on one oil rig!

Conclusion:

Played this in early beta and it's come a long way. I spent a whole evening with 3 friends and we couldnt complete on Expert [although I managed it on my own with 3 bots next day]. So got a whole night of fun out of it. 

Pros:

Cool escape vehicle, nice one.
Looked prettier than anything anyone, valve included, has done.
House was great fun.
Multiple routes was interesting.
Big set pieces were nice to watch.
Even the woods level which I always hate were nice to play.
Just a top not pro quality map.

Cons:

Helicopter scrap sticky bug.
The panic after the chopper goes on forever from what I can tell.
It's very dark indeed, need night vision goggles.
Really grasping at straws for something. It's great.
Finale felt a little flat? I like a little elevation myself. That's just taste tho.

Conclusion:

Waited obviously for ages for this one so expectations were very high as I'd played Portal Prelude and that was amazingly good. And I wasn't let down, more than I can say with Valve's DLCs. Who wouldn't prefer this to The Passing?!

It does share facets with Portal Prelude; although it's technically highly competent., polished, detailed and largely flawless it's also got playability issues.

With PP it was the case that really difficult test chambers came too soon, way ahead of the learning curve. This bogged things down a lot. Here is less quantitative and harder to see. More a case of timings being out with panics and lulls not being in a balanced order or being in the wrong place entirely. Sometimes it's nice to slow down and take in the details and the slowly building tension but when madness is thrown on you it's frustrating.

Hard to describe really but basically they seem like a team of amazingly good mappers but need more competent designers to lay out what's needed where. And play testers obviously with the helicopter incident. And no not after a job. Got one thanks!

Other then Death Aboard, this is the best.

Pros:

Nicely detailed.
Well laid out equipment.
Everything worked correctly.
Tanks and monster all spawned correctly.
A pleasure to play.

Cons:

2nd level we had to restart and we got a message saying the map was invalid. Still worked tho.
Finale a little gray and not very nautical.
Should have been trimmed to make 5 maps. First and last are short for a reason. Warm up for one and a quick run to the finale because you don't want to have to go to far every time you fair the finale. Let alone a panic event.

Conclusion:

After a terrible time on Stranded this was immensely enjoyable. Probably more than we would have otherwise. The mapper's obvious ignorance of L4D 5 map protocol strangely didn't annoy us too much :) However because of the massive last level before the finale we spent literally 75% of our 3 hour game time on the last map. Having to do the same event over and over. Eventually we said sod it and took it down from expert to normal so we could get to bed.

That all said. It looks great plays great, moved along well and no practical problems. It just felt like the middle of a whole campaign with a finale tagged on at the end.

Good job tho!