Pros:

+ Fresh feeling. Has quite a nice intro.
+ Snow and ice is quite nice. The fact that you slide keeps me occupied for quite a while.
+ "Snipers in the hills" are very useful. Unrealistic, but useful.
+ Great selection of weapons.
+ Unique. The building feels warm, and cozy.

Cons:

- The fireworks to call the snipers was in the most inconvenient place.
- Not many places to hold off.
- Dogs? Frozen animals? It was a bit out of place.
- For a hunting lodge, the owner must be extremely rich to only access it by helicopter, considering the entire place is a crater.
- The building is near-impossible to defend.

Conclusion:

Re-playable, and initially quite a fun map. But very difficult to go anywhere with. Map is quite small, and feels pretty clustered. It'd be nice if this map was expanded a little, adding a few more places to go and potentially, to hold off.

Pros:

+ Eerie through-out.
+ Jump scares. And lots of 'em.
+ Custom text on the walls fit perfectly.
+ Sound was clear, as well as all images that were used.
+ Well detailed. No glitches or bugs were found.
+ Maps will keep you engaged, and are easy to follow.

Cons:

- I needed a change of underwear afterwards.
- Maps could of been more frightful, as in, the first couple of maps in the forest was not that scary, just kept my team on their toes.
- Not very re-playable due to expected frights.
- Unless you're either playing Single Player, or the entire team stays extremely close to each other, most frights will be missed, as only the person at the front of the team experiences the trigger events.

Conclusion:

Fun map. Amazing with friends, but best played when you've not already played it. Jump scares ahoy, get someone who doesn't like horror, and make sure he/she goes in-front. Would definitely recommend this map for horror lovers.

Pros:

+ Accurately captured the environment of the city-life. Really felt like you was in Tokyo.
+ So... Many... Shops! Arcades, restaurants and other buildings were an extremely nice touch.
+ Finale had a very unexpected twist. I didn't think that the generation would need gas. And the gas was well hidden. Nice work there.
+ The final couple of maps felt like it was just recently bombed. It was glum, depressing, and a devoid of life. Not sure if it was intended, but that was pretty cool.
+ Adequate amount of supplies. Sometimes ran out, but always bumped into ammunition slightly afterwards.
+ Cable car movement was almost flawless. Unique idea, and thoroughly enjoyable.

Cons:

- Map 3 had a glitch with the cable car. After restarting the generator, the cable car didn't move... Maybe we did something wrong? We was missing something, perhaps? The doors shut, but won't open, and we couldn't get the car to move.
- Jumping in the cable car was a replica of extreme Human bumper cars.
- The finale was a little difficult to navigate around. So many twists and turns.
- Helicopter at the finale had no pilot. (No deductions)
- Map 1 was a living Hell of a maze. Fun, but, tedious.

Conclusion:

Definitely one of the most enjoyable maps. Great with friends. May be better with Gangnam playing in a few stores, and a dancing animation. Regardless, it was a great map. Amazingly detailed, and is the best chance of visiting Tokyo without actually going there yourself.

Pros:

+ Amazing start. The lullaby with the children was very eerie, it captured a beautiful atmosphere, and freaked everyone out at the same time.
+ Very detailed maps, lots of breathing space.
+ Supplies just kept on coming. And there was never too many. Just enough.
+ Many things to do while going through the campaign. It really felt like you was travelling.
+ The custom skins were flawless, and fit in with the environment.
+ Nice skybox.
+ The language on the walls, with the drawings, really felt like a nice touch. Ole Toros.

Cons:

- The finale was a little difficult to understand, took a lot of time to figure out where to go, where to jump from, where to jump to. Navigation took a good 15 minutes before even reaching the main building.
- Some places were not accurately pointing out where you should be going. But this can be good, as you spend time taking in the environment.

Conclusion:

Overall, an amazing map. Played it with a full team of Humans, which may have made navigation more complicated than it should be, but in the end, it was awesome. Definitely a favorite, and will love to repetitively play.

Pros:

+ A lot of things to build, and all things seem to be working.
+ Interesting "Big Daddy" gun, though, as you have mentioned, can not focus on anything else than specials or tanks... It makes life a little easy.
+ Noted as a barricading map, but more of a building map? It's still rather unique for actually building the fort from scratch.
+ Very fun with other players, as you can organise your team to take care of different floors and assign different people to build.
+ Challenging, however, may be too challenging, but I'll note it down that, at least it's challenging, than easy.
+ To balance the (almost) impossible horde, the players are given M60s and grenade launchers. (Yay!)
+ The game does not get any more difficult, through time. This is a positive thing, as the map is difficult as it is.

Cons:

- Bots are completely useless, and this map is only playable online, with other players.
- Way too many tanks, but you have already noticed this.
- The players are only given enough time to build one wall. Which is not going to hold me and three other players from a screaming zombie armada. As a result, there should be more time to build the walls, at the very least.
- The fort's first level is incredibly cramped, and that a single tank can destroy the entire team once inside the fort, thanks to the cramped conditions.
- After calling the radio, there is no actual dialogue from the radio, and no actual survival. But I won't deduct points because of this.
- As the fort's first floor is too cramped, I can only imagine that explains why the stairs to the second floor is outside of the fort... I do not see the logic in having a stair case... Outside of the fort?...
- There is no time between hordes, though this is realistic, it makes the tank appearances that much worse, as players do not get a break from the tanks.
- Zombies, and especially tanks will be glitched through the gate-like feature, and can be killed by players when trapped.
- Zombies will get to the second floor, and not even touch the first floor. No points deducted, as this is the fault of the path system for the AI, but this can be fixed by increasing the space between the ground, to the second floor, making the second floor unreachable to the zombies.

Conclusion:

As a conclusion, this map is my first, and last barricade map I will play; it's very good, don't get me wrong, the map had me and my friends hooked for hours on end. But there are many problems with the map that made it rather unplayable. We can get the first floor all set, but after the gate is on a recharge, we're just sitting ducks. By the time one tank is killed, another will come by only to destroy us.
7/10, may not be an amazing score, but I believe with a few tweaks, this could be a flawless map.

P.S. The developer of "Blood tunnel" was able to increase the amount of tanks after a certain amount of time. If this is the case, then you should be able reduce the amount of tanks. You could check with that developer for some hints and tips.