Pros:

- Unique styled campaign from start to finish, lots of custom events (I highly doubt it's NOT custom. Big plus)
- Hilarious scribbling. The witch and the Star Trek reference are gold
- The second last map looked like a secondary finale, so it was like two finale in one campaign
- Helluva finale. Survival and Gauntlet at the same map, with two Tanks at the last phase

Cons:

- The maps look blocky at most point
- At second last map in the elevator, a witch incapped and somehow teleported a bot. The other bot somehow got itself hanging on a ledge at the middle of nowhere. The last bot randomly teleports back and forth from trying to save the downed teammates to sticking up with me. As a side note, bots clipped through the floor
- The finale is kinda confusing with the UFO (which I thought was the escape pod), but I guess that's just me
- Needs more weapons and health packs on the first phase of the finale
- The puzzle on Crowd Control is confusing. I got a Tank for not completing it on time (no deduction, but still...)

Conclusion:

A must play, if you like different things, which I do

Left 4 Dead... in space!