Pros:

Good amount of zombies and tanks.

Cons:

Ending is horrible.  No direction to how to kill the head and if you end up playing with bots it takes forever to beat.  Yea you shoot the eyes but no direction that you have to shoot the back of the head.  

Also no direction that the supplies are hidden in the walls.  

Conclusion:

Ending made the map go from a 90 to a 40.  

Pros:

Just plain epic!!!
Tons of replay value.
Matches the movie extremely well.
Tons of items for use by the survivors.
Perfect teamplay map.

Cons:

If you hold out on the long staircase for a while(up to 15 minutes) sometimes the tanks stop coming.  Might be a server issue.  

Conclusion:

Perfect map to use your Left 4 Dead 2 in a totally epic way.  Relive the Battle for Helms deep as many times as you want and in as many ways as you want.  No bad things wrong with map.  No glitches that prevent enjoyment.  Recommend download by all Left 4 Dead 2 users.