Pros:

- Well-balanced throughout, be it zombie spawns or items
- Looks good
- Bots did generally okay except for map 3 at the end (couldn't find their way to the safe room)
- Non-linear routes

Cons:

- Glitchy graphics
- Map 2 explosion took a LONG time to set off, I still don't understand how to set it off
- Crashed a couple of times on Map 3 (during the pool panic event)
- Thunder noises in finale VERY annoying, even when the sky looks clear to me so it sounds completely random and out of place
- Confusing finale, didn't know what to refill at all
- Finale map too big

Conclusion:

Generally good, much credits to the placement of items as they are well placed. However, the finale left a rather bad impression on me. Not only the thunder is out of place, it distorts the rest of the audio every 10 seconds. First thunder sound sounded cool, until I realised it was a clear sky outside with little clouds in sight. Also more importantly, the map is too big for the boat to be found. First-timers would have totally no idea what to refill, running around like headless chickens.
Bugs dotted around, mainly graphical issues (especially Map 1). Map 3 gives me crash-to-desktops.

Pros:

- Nice and interesting maps
- Confusing routes at times, but that makes gameplay non-linear

Cons:

- too many panic events
- feel like infinite zombie spawns at times for indefinite reason
- Supplies locations very random and don't usually make sense
- Supplies amount too unbalanced
- Random trains running about at the end kill bots
- Last map too long

Conclusion:

- I like the map design. Very detailed.
- Personally I like the fact it has a lot of supplies, but the locations aren't exactly well thought-out. Most supplies spots are just a bunch of everything, doesn't feel like much thought has been put into it.
- Panic event after panic event after panic event, very unbalanced gameplay. Doesn't give time for players to 'enjoy' the maps.
- You might as well make the last map into two separate maps (way too many panic events for a map that includes the finale, a pain to restart if you lose due to all your bots being run over by a random train)
- Some panic events feel more or less like infinite zombie spawn (dunno if they are) for no apparent reason, for example the two consecutive panic events at the very beginning (before and after calling the elevator.)
- I get triple the amount of kills even compared to my runs of maps with lots of zombies. On one hand, it could be impressive, but the implication is that, there's a serious defect in planning of zombie events throughout the whole campaign.

Pros:

Looks good
Good weapon placement except at the end (finale)

Cons:

- Parts of the map feel repetitious
- Bots keep falling down the ladder on the last map
- Too many chargers and spitters (eg. sometimes I would get 3 chargers within 2 seconds of each other)
- The finale (last map) is VERY seizure-inducing with the flashes of weird colors, as if the dark corridors aren't giving my a headache already. The weird colour-contrast at the end is really off-putting
- The finale is too plain, but survivors die easily especially for bots when the last of their health kits are used on healing themselves from the ladder-fall!
- No grenades for finale
- Weird tank placement

Conclusion:

Was playing fine and didn't think too much about it during the first few maps, which could be a good thing (although sections of the map felt quite repetitious). The downfall is mainly at the end, which left a really bad impression on me overall. No matter if the campaign is mostly good, it needs a solid finale to give it a definitely feel and a satisfying finish, and this one surely is lacking in the last part.