Pros:

+ Intense as hell
+ Non-stop of specials
+ High firepower weapons everywhere (explosives, m60, turrets,...)
+ Correct structure of Helms Deep (walls, tunnels,..)
+ Long map,  but not boring
+ Correct using of sounds and music

Cons:

- Ugly particle effects
- Sometimes is a bit confusing what you must do
- Last room is a bit easy

Conclusion:

Maybe the best community survival map. Great work :D!