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.